Abstract: A slit lamp apparatus is suspended from a support structure such that no examination table is required in front of a patient during an examination. Accordingly, a patient's interaction with the slit lamp apparatus is unobstructed. Individual components of the slit lamp apparatus are optionally movable such that they may be positioned in desired positions relative to a patient's eye during an examination.

Abstract: A focusing unit can be inserted into and removed from an illumination light path by rotating around a supporting portion. An index light source, a green LED, is attached to the bottom of a base. A transparent acrylic-resin disk is fixed to the base. A deflection prism is attached to the bottom of the disk. A beam from the light source enters the deflection prism. A focus index forming portion is provided on the top of the disk. In the center of a light-shielding portion is formed a slit-like opening, under which split prisms are provided. Deflected by the prisms, the beam from the light source is split into two, right-half and left-half, directional beams, and combined with an illumination optical system, in the form of two slit images, at the opening.

Abstract: An apparatus for measuring a subject's eye having an instrument axis, comprising a slit projector for projecting slits of light, at least one sensor. The apparatus being adapted to form a first image of light from a first slit on the at least one sensor after the light scatters from the eye along a first pathway. The apparatus adapted to form a second image of light from the first slit on the at least one sensor after the light scatters from the eye along a second pathway. The apparatus comprising a processor operatively coupled to receive the first image and the second image, the processor adapted to perform a projective transformation of the second image and to combine data from the first image and the second image, after it is transformed, to form a third image.

Abstract: In one embodiment, an apparatus for optimizing vision correction procedures comprising: a narrow beam of light directed to a patient's retina; a dynamic defocus and compensation offsetting device configured to offset the defocus of a wavefront from an eye, a wavefront sensor configured to measure the local tilt of a number of subwavefronts sampled around an annular ring (the diameter of which can be dynamically changed) over the wavefront with the defocus offset; and a display device configured to display a two dimensional (2D) data points pattern in real time with each data point location representing a corresponding local tilt of the sampled subwavefronts. A proper defocus offset, not passive compensation, can reveal the predominant feature(s) of other wavefront aberration component(s), thus enabling a refractive surgeon to fine tune the vision correction procedure and minimize the remaining wavefront aberration(s) in real time.

Abstract: The invention pertains to a refractometer (01) for determining the refraction properties of an eye (02) of a patient with an optical projection device (03) that comprises at least one light source (08) that produces a light pattern, wherein the light pattern of the projection device (03) can be projected on the retina of the eye (02) and focused thereon, with an optical viewing device (04) that comprises at least one photoelectric sensor (12), wherein the light pattern reflected on the retina of the eye (02) can be viewed through the cornea and the lens of the eye with the viewing device (4) and projected on the photoelectric sensor (12) in the form of an image pattern, with an evaluation device for evaluating the image pattern recorded by the photoelectric sensor (12) and deriving the refraction properties of the eye, and with a distance measuring device for determining the distance between the refractometer (01) and the patient.

Abstract: An examination assembly advantageous for use with wheelchair bound patients comprises a rotatable stand which receives medical equipment, an arm assembly mounted on the stand comprising a main arm connected to the stand and an auxiliary arm operatively connected to the main arm, a table which mounts at least part of the medical equipment having a table area and an underside, and an S-bracket connecting the auxiliary arm to the table such that the auxiliary arm is remote from the table. The auxiliary arm is above the table and the S-bracket comprises a mounting flange, an underside flange and a linking flange connecting the mounting flange to the underside flange. Fasteners connect the underside flange to the table.

Abstract: The invention provides a method of diagnosing, prognosing, staging, and/or monitoring a mammalian amyloidogenic disorder or a predisposition thereto by detecting a protein or polypeptide aggregate in the cortical and/or supranuclear regions of an ocular lens of the mammal.

Abstract: An ophthalmological measurement apparatus (10) for determining the axial length (LA) of an eye (4) includes an optical interferometric first measurement system (1) for determining a relative position (A) of the retina (41) of the eye (4), a non-interferometric second measurement system (2) for determining a relative position (B) of the cornea (42) of the eye (4), and processing means (3) for determining the axial length (LA) of the eye (4) on the basis of the relative position (A) of the retina (41) and of the relative position (B) of the cornea (42).

Abstract: An apparatus for measuring a subject's cornea, comprising (A.) a slit projection subsystem comprising a light source, (B.) a mask subsystem disposed in a path of light from the light source, comprising a first slit mask defining a plurality of apertures, (C.) a movement apparatus adapted to move at least a portion of the slit projection subsystem, the movement apparatus configured and arranged such that, by moving the portion of the slit projection subsystem, portions of the light can be selectively transmitted through an aperture of the plurality of apertures toward the cornea, (D.) an imaging element configured and arranged to image at least one of the plurality of apertures onto the cornea, and (E.) an image capture subsystem arranged to capture images of the portions of light after the light impinges on the cornea.

Abstract: A visual axis and alignment measurement system and method of using same are disclosed. In particular, a visual axis measurement system of the present disclosure includes a visual axis measurement device and a near point target. The visual axis measurement device includes a pair of opaque lenses, each having a slit therein, that are adjustably coupled via a coupling mechanism. The visual axis measurement device also includes a linear measurement device. Via self-adjustment, the patient may align the respective slits for his/her dominant and non-dominant eyes along his/her visual axes until the near point target is in focus. After which, the distance between the centers of the slits is measured in order to determine accurately the placement of bifocal lens segments within eyeglass lenses. In doing so, it is ensured that the prescription for, for example, progressive bifocal corrective lenses, which have narrow viewing areas, is correct.

Abstract: A binocular slit lamp microscope for observing a patient's eye, comprises: an objective lens; binocular eyepieces; and a mechanism that includes a plurality of optical systems and is arranged to switch the optical systems to be selectively placed in a predetermined position between the objective lens and the binocular eyepieces on an observation optical path, the mechanism including a variable magnification optical system for changing observation magnification and a viewing angle changing optical system for changing a viewing angle between a right viewing path and a left viewing path.

Abstract: Among other things, an illumination device (10) is described for one, two or more observation beam paths, each with an observation device having an observation beam bundle, in particular for an operating microscope, having at least one light source (12) for producing at least one illumination beam bundle for illuminating an object to be observed (13), in particular, an eye to be observed, wherein the at least one illumination beam bundle runs coaxially to an observation beam bundle. It is provided according to the invention, in order to be able to suppress disruptive reflections, that illumination device (10) has an illumination optics (11) that is constructed according to the Köhler principle of illumination, and in which at least one reflection diaphragm (18) is provided in order to avoid light reflected from the surface of an objective element (19). In addition, a correspondingly improved observation device is described.

Abstract: A slit lamp apparatus is suspended from a support structure such that no examination table is required in front of a patient during an examination. Accordingly, a patient's interaction with the slit lamp apparatus is unobstructed. Individual components of the slit lamp apparatus are optionally movable such that they may be positioned in desired positions relative to a patient's eye during an examination.

Abstract: An apparatus for cross-sectional imaging of an anterior ocular segment wherein a stationary cylindrical body disposed projecting out from a body of the apparatus, and an illuminating optical system and an imaging optical system are disposed within the cylindrical body with a front aperture of the cylindrical body as a common aperture thereof so as to be rotatable in unison about an eye-side optical axis of the illuminating optical system. At least one proximal direction reflecting mirror being disposed within an interior of the cylindrical body in proximity to the front aperture for reflecting scattered light by an examined eye on an optical axis of the imaging optical system to a direction proximate to an optical axis of the illuminating optical system.

Abstract: The present invention is directed to an arrangement and a method for eye examination and/or for determining biometric eye data in which the movement of the eyes is compensated through the use of an eye tracker unit. The arrangement comprises a controllable digital illumination unit and an observation system which are arranged on separate supporting arms. A central control unit has connections to an image recording unit, an optical imaging system, an eye tracker unit and an output unit. Further, transmitter elements and/or actuating drives are provided at the separate supporting arms, at the zoom system and at the magnification changer. The examination can be adapted in an optimal manner to the task at hand by means of the structured illumination patterns that can be generated in a variable manner. Detection of all adjusting parameters relevant for recording can be used for calculations and for reconstructing the pertinent observation conditions. In case of repeated examinations for determining changes, e.g.

Abstract: An opthalmologic photographing apparatus which is used to observe and photograph a fundus oculi of an eye to be examined, includes an observation light source illuminating the eye to observe the fundus oculi of the eye, a photographing light source illuminating the eye to photograph an image of the fundus oculi of the eye, an aperture through which light illuminated from either the observation light source or the photographing light source and reflected on the fundus oculi of the eye is observed or photographed, and a control device which is configured to control an opening area of the aperture. The control device sets the opening area of the aperture to an opened observing opening area when observing the fundus oculi, and to a narrowed photographing opening area when photographing the image of the fundus oculi.

Abstract: An opthalmoscope comprising an attachment portion, capable of being clipped onto a commonly available light source, such as a penlight; a light deflector, such as a mirror or prism, for deflecting light from the light source into a subject eye; a housing, for holding the deflector in fixed relation to the attachment portion; and a stenopeic aperture, in the housing, between the light source and the deflector, for limiting the light incident on the deflector to a specified meridian.

Abstract: A reflectometry instrument includes a light source, a spectrometer, and a first and second lens. The light source emits an illumination beam to the macula. The spectrometer measures a detection beam that is a portion of the illumination beam reflected from the eye and is indicative of the eye characteristics (e.g. macular pigment). The first and second lenses transmit the illumination beam to the macula and transmit the detection beam from the macula to the spectrometer. The instrument is used on an undilated pupil and minimizes unwanted reflections by at least one of the following: the first and second lenses include anti-reflection coatings; the illumination and detection beams pass through the first and second lenses at locations offset from their centers; and the illumination and the detection beams remain separated when passing through the first and second lenses. Zeaxanthin, lutein, and the total macular pigment levels are measured by the instrument.

Abstract: A hand-held digital camera for obtaining images of a portion of a patient's body and having a hand-held housing, a visible light source located within the housing for providing light along an illumination path from the housing aperture to the patient's body, an image sensor located within the housing that detects light returning from the patient's body along an imaging path that passes into the housing aperture, an optical system located within the housing with separate illumination and imaging paths, an external optical aperture common to the illumination and imaging systems, wherein the illumination and imaging sub-apertures are wholly contained within the common external aperture, are longitudinally coincident, and are laterally separated and non-overlapping, a digital memory device for storing captured images, an output display carried by the housing, and the ability to electronically transmit stored images. The camera can be used for retinal imaging and for otoscopy.

Abstract: A new and improved slit lamp microscope table with a front recess of suitable size to accommodate the torso of the occupant of a wheel chair or an obese individual. With the table set at an appropriate elevation, the handicapped individual can move his or her wheel chair to the vicinity of the table. The wheel chair is rolled toward the table until the user is located with his or her torso in the recess. Once the patient is in position, the table can be lowered to the point at which the arm rests of the table come into contact with the arms on the wheel chair and more positively hold the table and wheel chair in the desired relation.

Abstract: A variable-wedge rotating-disk attenuator for use in an ophthalmic endoilluminator is disclosed. The attenuator includes a wedge attached to an axle. The size of the wedge can be adjusted over a variable angle as measured through an arc of the wedge. The axle to which the wedge is attached rotates such that the wedge rotates around a pivot defined by the axle. The variable-wedge rotating-disk attenuator is located such that it affects the intensity of a light beam transmitted into an eye.

Abstract: An optical imaging apparatus, in particular an ophthalmoscope or microscope or transillumination microscope, comprising a light source arrangement (20) and an illumination beam path (3) which is predetermined at least by an illumination lens arrangement (4), and an observation beam path (11) which is predetermined at least by an observation lens arrangement (12), wherein at least one illumination field aperture (2) is arranged in the illumination beam path (3) and at least one observation field aperture (13) is arranged in the observation beam path (11) and the illumination beam path (3) and the observation beam path (11) are arranged at an angle different from 0° in an illumination image plane (6) in which the illumination field aperture (2) can be imaged by the illumination lens arrangement (4), wherein the illumination lens arrangement (4) and the observation lens arrangement (12) are lens arrangements which are separate from each other, wherein a single light-reflecting mirror body (14) which is oscillati

Abstract: Method and arrangement for performing measurements of the topography of a surface (20), such as topography of an eye surface (20), wherein projecting means (1, 12) for projecting an image onto said surface (20) comprises a projection light source (1), and wherein at least a fraction of light leaving the surface (20) as a result of said projection is received using one or more receiving units (31, 32), such as charged coupled device (CCD) based cameras. The topography of the surface (20) is determined by analysis of said fraction of light leaving the surface (20), due to thermal emission and the image projected onto the surface (20) is projected with light comprising a colour for which the surface (20) is opaque, such as infrared light.

Abstract: A slit lamp for illuminating an eye comprises several LEDs electrically coupled to an LED driver. A user input accepts input for a length, a width and an intensity of a shaped beam of light. An LED driver selectively drives a set of LEDs of an LED array to form a shaped light beam having a desired size across a beam cross-section. In some embodiments, several optical fibers at a first end of a fiber optic manifold are optically coupled to LEDs of an LED array, and an optic is placed near a second end of a fiber optic manifold. Several ends of optical fibers of the fiber optic manifold are optically coupled to the set of selectively driven LEDs, and are arranged so as to form the shaped light beam having a desired size across the beam cross-section.

Abstract: A sterile barrier is provided for use with a slit lamp. The slit lamp has a proximal handle and a distal light slit transmitting window. The sterile barrier comprises a flexible tubular membrane having a first end, a second end, and an opening therebetween. The opening may be larger adjacent the first end than a handle of the slit lamp. A resilient band is attached to the first end of the tubular membrane. The first end and resilient band in a resiliently expanded configuration are sufficiently large to receive the handle proximally therethrough. The resilient band in the relaxed configuration will releasably restrain the sterile barrier from moving proximally off the handle.

Abstract: An apparatus for observing an eye of an examinee, comprises: an irradiation optical system for irradiating and two-dimensionally scanning a laser beam onto an observational objective part of the eye; an observation optical system having a photo-receiving element, for photo-receiving the laser beam reflected by the objective part to obtain an image of the objective part, the observation optical system sharing at least a part of the irradiation optical system; a display which displays the obtained image; a polarizing member arranged on an optical axis of the observation optical system, an arrangement angle of the polarizing member with respect to the optical axis being changeable to change a polarized component to be transmitted by the polarizing member.

Abstract: A grid formed with apertures of a predetermined shape is illuminated with light from a lamp and projected onto a tear meniscus accumulated on the lower eyelid. The aperture image projected on the tear film is imaged by a CCD camera. The tear meniscus functions as a concave mirror, so that the magnification factor depends on the radius of meniscus curvature. A processor calculates the magnitude of the grid image and evaluates the radius of meniscus curvature. Since the volume of lacrimal fluid varies depending upon the radius of meniscus curvature, the latter is used as a value representing the lacrimal fluid volume for dry eye diagnose purposes.

Abstract: Disclosed is a slit lamp microscope capable of forming a slit superior in terms of parallelism. The slit lamp microscope includes casings (100L and 100R) to the bottoms surfaces of which slit blades (107L) and (107R) are fixed and which are connected together so as to be rotatable around shaft members (102), and an inter-casing distance varying member (87) adapted to change the distance between the casings (100L and 100R) in correspondence with vertical movement of an ascent/descent shaft (86). Coil-like portions of torsion springs (103) are wound around the shaft members (102) to which the casings (100L and 100R) are connected. The torsion springs (103) urge the casings (100L and 100R) so as to bring the slit blades (107L and 107R) close to each other. Further, the casings (100L and 100R) are equipped with U-shaped springs (106) urging protrusions (100L? and 100R?) thereof so as to press them against the shaft members (102).

Abstract: A microscope for operation having an illuminating optical system with an illuminating field diaphragm, for directing an illuminating light toward an eye to be operated upon, an objective body tube with an objective positioned in the body tube to be opposite to the eye, a pair of observing optical systems disposed at opposite sides of an optical axis of the objective for observing the eye, a front lens disposed between the objective and the eye to collect the illuminating light and to guide the collected light in the front of the eye for illuminating the interior of the eye, and a slit plate provided in the optical path of the illuminating optical system, with the illuminating field diaphragm being conjugate with an anterior focus position u0 of the objective, which is conjugate with a fundus through the front lens.

Abstract: Provided is an operation microscope apparatus for easily and speedily obtaining a suitable separation state between illumination light and observation light in a case where a front lens is replaced by another one. An illumination optical system includes a slit plate in which slit holes having different slit widths are formed. Each of a plurality of front lens having different refractive powers is integrally formed with corresponding one of storing sections. One of the storing sections is attached to an elevation regulating member. The elevation regulating member includes micro-switches. Each of the storing sections includes a protruding portion for turning on corresponding one of the micro-switches at the time of attachment. A control unit sets an illumination angle of the illumination light and a slit width of a slit based on a detection signal from a micro-switch which becomes an on state.

Abstract: An ophthalmoscope includes a housing (12) in which there are arranged an observing unit and a light source between which there are/is arranged a diaphragm and/or a filter device that can be set via a swivel lever device (16, 17) mounted outside on the housing (12). The swivel lever device (16, 17) can be locked in respective latch stages by a locking device (41).

Abstract: An illumination apparatus, usable for example as a slit lamp, comprises a light-emitter (2) and an optical element (12) having a free-form surface (13), and optionally a slit aperture (9) and an imaging optic (10). The concept of the present invention is that the free-form surface (13) is employed to generate a resultant illumination beam having a slit-shaped cross-section.

Abstract: A solution by which an examination of the cornea for possible encapsulations, air bubbles, or other irregularities following a refractive surgery can be carried out directly at the treatment device instead of the patient having to be transferred to an examination device. The additional slit illumination system includes two slit projector units substantially symmetrically mounted at an angle of about 40° to the optical axis of the refractive treatment device, and fixed and focused on the eye of the patient to be examined. The slit projector units include a light source, a projection optical system, and beam forming and/or conducting optical components. Although intended for surgical microscopes, it can also be used for other opthalmologic treatment devices that would benefit from a slit projection system for the examination before, during, or after the treatment procedure.

Abstract: The ophthalmologic apparatus 1 splits low coherence light LO into a signal light LS and a reference light LR, the interference light LC being generated by having the signal light LS overlap with the reference light LR, and detects this interference light LC. In addition, the apparatus comprises an optical alignment system 190A for performing the alignment of an optical system forming the signal light path to the eye E. An intraocular distance calculator 214 determines the distance between the position where the signal light LS has been introduced onto the eye E and the position where the signal light LS has been reflected by the fundus oculi E based on length of the optical path of the signal light, the length of the optical path of the reference signal light, the working distance after alignment, and the detection signal output by the CCD 184 (or signal intensity data).

Abstract: A binocular slit lamp microscope for observing a patient's eye, comprises: an objective lens; binocular eyepieces; and a mechanism that includes a plurality of optical systems and is arranged to switch the optical systems to be selectively placed in a predetermined position between the objective lens and the binocular eyepieces on an observation optical path, the mechanism including a variable magnification optical system for changing observation magnification and a viewing angle changing optical system for changing a viewing angle between a right viewing path and a left viewing path.

Abstract: The invention is a device for examining the anterior and the posterior segments of the eyeball in a patient's eye, including a stereoscopic microscope system and an oscillating slit lamp disposed downstream of the stereoscopic microscope in the viewing direction in longitudinal direction to two parallel optical beam paths. The invention in the region between the binocular tube objective system and the main objective provides an optical deflection means which does not optically interfere with the stereoscopic beam paths of the stereoscopic microscope and via which an observation beam path and an illumination beam path of an ophthalmoscope can be coupled in in such a manner that the optical observation beam path and the illumination beam path deflected by the optical deflection means each pass through the main objective in viewing direction.

Abstract: A focusing unit (11) is constituted of a prism base (11a), deflection prisms (11b and 11c), and a slit chart (11e) having a slit opening (11d), and the deflection prisms (11b and 11c) are arranged so that deflecting directions may become reverse. The slit opening (11d) is made equally to spread across the deflection prisms (11b and 11c) approximately and is impermeable except the slit opening (11d), and light incident on the deflection prisms (11b and 11c) passes only this slit opening (11d). In addition, the light which is emitted by a focus index illumination light source illuminates the slit opening (11d) through the deflection prisms (11b and 11c). As to an image of the illuminated slit opening (11d), two slit images are formed on a fundus of eye by actions of the deflection prisms 11b and 11c. Focus adjustment is made by aligning these slit images (S1 and S2) in a straight line.

Abstract: The invention relates to an ophthalmoscope for examining the fundus of an eye of a patient, which comprises at least one illuminating device producing at least one illuminating beam, in addition to an imaging lens system which can be associated with the illuminating device and which images the illuminating beam onto the fundus of the eye of a patient; also comprising an observation device, wherein the imaging lens system images an observation beam onto the fundus of the eye, said observation beam being produced by reflecting the illuminating beam; also comprising a diaphragm arrangement introduced into the illuminating beam and the observation beam, whereby the gap of said diaphragm can be variably modified and synchronized.

Abstract: A slit lamp for illuminating an eye comprises several LEDs electrically coupled to an LED driver. A user input accepts input for a length, a width and an intensity of a shaped beam of light. An LED driver selectively drives a set of LEDs of an LED array to form a shaped light beam having a desired size across a beam cross-section. In some embodiments, several optical fibers at a first end of a fiber optic manifold are optically coupled to LEDs of an LED array, and an optic is placed near a second end of a fiber optic manifold. Several ends of optical fibers of the fiber optic manifold are optically coupled to the set of selectively driven LEDs, and are arranged so as to form the shaped light beam having a desired size across the beam cross-section.

Abstract: Systems and methods orient sensors of an optical system that measures aberrations of an eye. The aberration measurement system may include an optical aberration sensor and an eye image sensor. An asymmetric feature can be imposed in an optical beam path so as to introduce artifacts at the sensors. The optical aberration sensor is often oriented relative to an eye image sensor in response to the asymmetric feature of an optical beam path. In some embodiments, a tool supported by a rail imposes the asymmetric feature on the optical beam path. Aberrations of the eye are measured along the optical beam path with an optical aberration sensor while an eye image sensor forms an image of a tissue structure of the eye positioned along the beam optical path. An aberration correcting shape is identified and ablated in corneal tissue with a laser.

Abstract: A sterile hand held slit lamp for laser refractive surgery includes a charging base that charges a battery while a hand held slit lamp is positioned thereon. A sterile supple cover is positioned over a slit lamp handle while supported by the charging base. A sterile gloved operator grasps the slit lamp handle covered by the sterile cover and illuminates an eye with a slit lamp beam. In many embodiments, an operating microscope provides a view of the eye to an operator while the slit lamp beam illuminates the eye. Operator adjustable controls located on the slit lamp handle are manipulated through a sterile cover and control a length, a width and an intensity of the slit lamp beam. An operator wearing sterile gloves adjusts a position of a piece of tissue near an incision, and removes debris from a surgical incision in tissue after viewing the eye illuminated with the hand held slit lamp beam.

Abstract: An ophthalmic examination and treatment system including ophthalmic medical instruments, wireless imaging devices mounted on the ophthalmic medical instruments, and one or more display devices for displaying images captured with the imaging devices. Each imaging device includes transmission/reception unit for transmission and reception of information data with the display device by wireless communication. The transmission/reception unit has an ID allocated correspondingly to each imaging device, transmits a data signal with the ID signal to the transmission/reception unit, and when an ID confirmation signal attached to a control signal from the transmission/reception unit and the own ID coincide, receives the control signal. The display device receives a data signal with an ID signal from each imaging device, conducts displaying with the data signal corresponding to the ID and enables the remote control of the imaging device corresponding to the ID by attaching the ID signal and sending the control signal.

Abstract: Combined equipment for non-contacting determination of axial length (AL), anterior chamber depth (VKT) and corneal curvature (HHK) of the eye, are also important for the selection of the intraocular lens IOL to be implanted, particularly the selection of an intraocular lens (IOL) to be implanted, preferably with fixation of the eye by means of a fixating lamp and/or illumination through light sources grouped eccentrically about the observation axis.

Abstract: A visual axis and alignment measurement system and method of using same are disclosed. In particular, a visual axis measurement system of the present disclosure includes a visual axis measurement device and a near point target. The visual axis measurement device includes a pair of opaque lenses, each having a slit therein, that are adjustably coupled via a coupling mechanism. The visual axis measurement device also includes a linear measurement device. Via self-adjustment, the patient may align the respective slits for his/her dominant and non-dominant eyes along his/her visual axes until the near point target is in focus. After which, the distance between the centers of the slits is measured in order to determine accurately the placement of bifocal lens segments within eyeglass lenses. In doing so, it is ensured that the prescription for, for example, progressive bifocal corrective lenses, which have narrow viewing areas, is correct.

Abstract: An ophthalmic measurement apparatus capable of obtaining refractive power containing a skew ray component, and further obtaining wavefront aberration from the refractive power with more ease and higher precision includes an optical system projecting slit light bundles onto a fundus of an examinee's eye and scanning the light bundles in predetermined first and second directions, an optical system with photodetectors placed in positions approximately conjugate with a cornea of the eye and placed in at least one meridian direction orthogonal to an optical axis of the photo-receiving optical system, and an arithmetic part obtaining, based on signals indicating phase differences from one of the photodetectors when photo-receiving the light bundles scanned in the first and second directions, refractive power in two directions at a corneal position corresponding to the photodetector position, and further obtains at least one of refractive power and a wavefront inclination by vector-synthesizing the obtained refracti

Abstract: There is provided an ophthalmologic apparatus that prevents ghost light from generating. In the ophthalmologic apparatus, on an optical path commonly used for an eye fundus illumination optical system and an image taking optical system including an image taking diaphragm, an objective lens for forming an image of the image taking diaphragm onto an anterior ocular segment of an eye to be examined is provided. The objective lens is formed such that the entire light beam from the center of the image taking diaphragm is substantially perpendicularly incident thereon. The objective lens is a refractive index distributed lens in which a refractive index is high in a vicinity of an optical axis and reduces as a distance from the optical axis increases.

Abstract: A corneal topography slit image alignment system 10, includes a half-slit projector 14 for projecting half-slit images onto a patient's eye 16. Half-slit images 28 and 30 are aligned into a single slit image. A camera 18 captures an image of the aligned slit image. Processor 20 including a memory 26 connected to the half-slit projector 12 and the camera 18 analyzes the alignment of the half-slit images 28 and 30. An edge detector 22 detects the edges of each captured half-slit image and determines an amount of misalignment of the half-slit images 28 and 30 relative to half-slit images being aligned into a single slit image. This amount of misalignment allows computer processor 20 to correct the three-dimensional coordinates of the slit images obtained by a slit beam system 14.

Abstract: An eye refractive power measurement apparatus capable of reducing an influence of scattered light and performing measurement with high accuracy. The apparatus has a measurement optical system including a system having a light source projecting spot-shaped measurement light onto a fundus of an examinee's eye, and a system having an optical axis, a photodetector, a ring-shaped aperture, a member by which the light reflected from the fundus via a peripheral pupillary portion and the aperture forms a ring-shaped image on the photodetector, and a diaphragm of a size such that a projection region by the diaphragm on the photodetector overlaps the axis within a predetermined amount and that the reflection light forms the image within the region in projecting the measurement light onto a myopic eye with the measurable highest diopter, and a part which obtains the eye refractive power based on an output from the photodetector.

Abstract: An ophthalmoscope has illuminating optics (10) for projecting a beam of light into an eye under examination and imaging optics (14) for creating an image of said eye for viewing by a user. The imaging optics comprises an objective lens system (16) and an eye piece lens system (20). Two corneal reflex stops (138 and 148) are positioned one on either side of the corneal image formed by the objective lens system. The stops block reflections from the cornea of the eye under examination over a range of distances of the ophthalmoscope from the eye. The use of the two corneal reflex stops results in the precise positioning of the ophthalmoscope relative to the eye under examination not being critical to the blocking of the corneal reflex.

Abstract: There is provided an ophthalmologic apparatus that prevents ghost light from generating. In the ophthalmologic apparatus, on an optical path commonly used for an eye fundus illumination optical system and an image taking optical system including an image taking diaphragm, an objective lens for forming an image of the image taking diaphragm onto an anterior ocular segment of an eye to be examined is provided. The objective lens is formed such that the entire light beam from the center of the image taking diaphragm is substantially perpendicularly incident thereon. The objective lens is a refractive index distributed lens in which a refractive index is high in a vicinity of an optical axis and reduces as a distance from the optical axis increases.