Abstract: A device for adjusting a distance between lens tube assemblies, a head-mounted display device and a step-wise adjustment mechanism are provided. The device for adjusting the distance between the lens tube assemblies includes: a guide shaft configured to mount two lens tube assemblies, with the two lens tube assemblies slidable toward or away from each other; a pair of racks respectively arranged on the two lens tube assemblies; a pair of dial gears, each of which includes a gear portion engaged with the rack and a dial portion configured to drive the gear portion to rotate under an external force; and a pair of dial gear shafts configured to mount the pair of dial gears to a housing of a head-mounted display device where the two lens tube assemblies are located, with the dial gear rotatable relative to the dial gear shaft.

Abstract: An ophthalmologic measurement apparatus includes a measurement unit that acquires an image of an eye to be inspected, a main unit in which the measurement unit is placed and which includes a holding part for holding the main unit with a hand, an eyepiece part having a shape asymmetric about a measurement optical axis of the measurement unit and capable of being in contact with an area around an eye to be inspected, a position detection unit that detects a position of the eyepiece part, an acquisition unit that acquires eye distinguishing information indicating whether the eye is a right eye or a left eye, and a display control unit that controls a display unit to display an image of the eye such that the image of the eye is rotated in a clockwise or counterclockwise direction based on the eye distinguishing information and a resultant image is displayed.

Abstract: Methods and devices are provided to obtain refractive correction with superior visual acuity (e.g., 20/10) by achieving an astigmatism-free customized refractive correction. The astigmatism-free customized refractive correction involves obtaining an objective and precise measurement of cylindrical power in a resolution between 0.01 D and 0.10 D in an eye using an objective aberrometer, reliably relating the cylindrical axis obtained from the objective aberrometer to that in a phoroptor, determining an optimized focus error of an eye through subjective refraction with a phoroptor, generating a customized refraction by combining the objective measured cylindrical power, the objective measured cylindrical axis, and the subjectively measured focus power, fabricating a custom lens with a tolerance finer than 0.09 D based on the generated customized refraction, and delivering an ophthalmic lens that can provide an astigmatism-free refractive correction for an eye.

Abstract: The invention provides a hybrid OCT scanning device which improves OCT scanning of targets, including adaption for a ophthalmic targets (i.e. cornea, retina and fovea areas). The invention provides a movable beam modifying element which is adapted to be interposed in the probe radiation directed to the target, and the interposition of the movable element is synchronous with the periodicity of the OCT scan beam. The beam modifying element may include any of angular deflection regions, optical delay regions, or combinations of deflection and delay regions. Such regions of deflection and/or delay translate into a governable scan range, both lateral and depth, of a target region.

Abstract: An ophthalmoscope. Implementations include a handle coupled to a head where the head includes a front section coupled with a diopter wheel and the front section includes a view window. A back section fixedly attached to the front section includes a diopter number viewer, a trigger button, and a digital imaging section. The digital imaging section may include a liquid crystal display (LCD) screen. The trigger button may be adjacent to the handle and may be positioned opposite the front section between the handle and the LCD screen. The back section may include a rounded projection rotatably coupled with a central hole in the diopter wheel extending from a diopter surface substantially parallel with and in close proximity to the diopter wheel. The diopter number viewer may extend from the diopter surface away from the diopter wheel and may include an opening configured to expose a diopter number.

Abstract: An ophthalmoscope. Implementations include a handle coupled to a head where the head includes a front section coupled with a diopter wheel and the front section includes a view window. A back section fixedly attached to the front section includes a diopter number viewer, a trigger button, and a digital imaging section. The digital imaging section may include a liquid crystal display (LCD) screen. The trigger button may be adjacent to the handle and may be positioned opposite the front section between the handle and the LCD screen. The back section may include a rounded projection rotatably coupled with a central hole in the diopter wheel extending from a diopter surface substantially parallel with and in close proximity to the diopter wheel. The diopter number viewer may extend from the diopter surface away from the diopter wheel and may include an opening configured to expose a diopter number.

Abstract: An opthalmoscope. Implementations include a handle coupled to a head where the head includes a front section coupled with a diopter wheel and the front section includes a view window. A back section fixedly attached to the front section includes a diopter number viewer, a trigger button, and a digital imaging section. The digital imaging section may include a liquid crystal display (LCD) screen. The trigger button may be adjacent to the handle and may be positioned opposite the front section between the handle and the LCD screen. The back section may include a rounded projection rotatably coupled with a central hole in the diopter wheel extending from a diopter surface substantially parallel with and in close proximity to the diopter wheel. The diopter number viewer may extend from the diopter surface away from the diopter wheel and may include an opening configured to expose a diopter number.

Abstract: An opthalmoscope. Implementations include a handle coupled to a head where the head includes a front section coupled with a diopter wheel and the front section includes a view window. A back section fixedly attached to the front section includes a diopter number viewer, a trigger button, and a digital imaging section. The digital imaging section may include a liquid crystal display (LCD) screen. The trigger button may be adjacent to the handle and may be positioned opposite the front section between the handle and the LCD screen. The back section may include a rounded projection rotatably coupled with a central hole in the diopter wheel extending from a diopter surface substantially parallel with and in close proximity to the diopter wheel. The diopter number viewer may extend from the diopter surface away from the diopter wheel and may include an opening configured to expose a diopter number.

Abstract: An electro-active phoropter and a method of using the electro-active phoropter to measure a patient's vision prescription is disclosed. The electro-active phoropter includes a series of individually addressable electro-active lenses. The lenses have either a positive or negative optical power when an electrical potential is applied across the lens and a neutral optical power when no electrical potential is applied across the lens. Each lens provides an optical power that is part of a net optical power of the series of lenses when a patient views through the phoropter. The optical power of the phoropter can be incrementally adjusted by changing the distribution of the electrical potential across the different lenses of the series to provide increasing or decreasing optical power until a patient achieves a desired level of clarity and a vision prescription has been determined.

Abstract: An optometric apparatus comprises: a pair of right and left lens chamber units, each unit including a test window and optical elements to be selectively disposed in the test window; and a controller including a transmitting part which transmits a control signal in the form of an optical signal to the lens chamber units to selectively dispose the optical elements in the test window, the transmitting part being adapted to widen an extent of diffusion of luminous flux of the optical signal more greatly in a forward to upward directions than in a lateral direction.

Abstract: A fundus imaging apparatus comprises: a beam emitter which simultaneously emits a first laser beam and a second laser beam having a different wavelength from the first beam; an irradiation optical system having a beam scanner which scans the emitted first and second beams in two dimensions on a fundus, the irradiation optical system being adapted to irradiate the emitted first and second beams onto the fundus; a first filter which intercepts the first and second beams reflected by the fundus and second fluorescence from the fundus by irradiation of the second beam and transmits first fluorescence from the fundus by irradiation of the first beam; a second filter which intercepts the first and second beams reflected by the fundus and the first fluorescence from the fundus and transmits the second fluorescence from the fundus; an imaging optical system having a photo-receiving element which receives the first fluorescence having passed through the first filter and the second fluorescence having passed through th

Abstract: An optometric apparatus (2) includes a rotary prism (136a, 136b) disposed in front of the eye (E), for adding a prism degree to the eye (E); a rotation device including a pulse motor (181, 184) and a rotation transmitting mechanism (146, 147, 176, 176a, 177, 177a, 178, 179, 182, 183, 185, 186) for transmitting rotation of the pulse motor to the rotary prism, the rotation device being adapted for rotating the rotary prism to change the prism degree; a command device (43a, 43b) for generating a command signal to start and stop the rotation of the rotary prism; and a control unit (60) for controlling the rotation device to drive the pulse motor to rotate at a speed of 5 pulses/sec. or more when the control unit receives the rotation start command signal until when receives the rotation stop command signal, and, to change the prism degree at a speed of 0.1 to 1.0 prism/sec.

Abstract: An optometric apparatus comprises: a pair of right and left lens chamber units, each unit including a test window and optical elements to be selectively disposed in the test window; and a controller including a transmitting part which transmits a control signal in the form of an optical signal to the lens chamber units to selectively dispose the optical elements in the test window, the transmitting part being adapted to widen an extent of diffusion of luminous flux of the optical signal more greatly in a forward to upward directions than in a lateral direction.

Abstract: A subjective ophthalmic refractor of a type comprising a ring-shaped cylinder power scale having an internal gear actuated by a scale drive gear connected to a cylinder power adjustment knob of the refractor is improved by providing a bearing insert within the cylinder power scale. The bearing insert includes radially and axially facing annular bearing surfaces extending about a substantial portion of the scale, and a cut-out region allowing space necessary for the scale drive gear.

Abstract: A subjective ophthalmic refractor comprises a cylinder power adjustment knob for simultaneously actuating a cylinder power scale and an indexable lens carrier drive assembly. The drive assembly includes a gear phasing hub designed to allow a scale marking to be centered in a display window of the refractor and components of the drive assembly to be set in proper rotational orientation as independent operations.

Abstract: A compact and precise phoropter of low requirements as to material and favorable as to kinematics comprises two observation channels in each of which a plurality of equal sized disks are rotatably and coaxially arranged about an axle, each of said disks being provided with a number of element sites where spherical lenses, cylindrical lenses, cross cylinders and further optically effective accessory elements are located. At least the cylindrical lenses are seated for rotation on said disks and are provided with first drive wheels, the diameters of the latter being substantially equal to the diameter of a second drive wheel rotatable with the axle and being associated to the respective disk. The diameters of the entire disks are determined by the diameters of the first and the second drive wheels and are at least three-fold the diameter of the first drive wheels.

Abstract: A glare tester suitable for use with conventional subjective refractors for testing visual acuity is disclosed. The tester may be fitted to new refractors or retrofitted to existing refractors. The preferred tester is a plastic annular ring with a plurality of LEDs mounted in recesses to direct light toward the test axis and a surface to reflect the LED light toward the patient's eye. A coating on the ring surface opposite the patient's eye improves the LED efficiency.

Abstract: Techniques and retinoscopic apparatus for measuring or determining a patient's optical error are disclosed. The techniques include overrefraction and can be performed from a fixed position, avoiding the practitioner's need to move back and forth relative to the patient's eye. Equipment associated with the apparatus is adapted to record the location of the retinoscope slide (relative to its upper or lower position) during the examination to provide information concerning the optical error present in the patient's eye. Other associated equipment can include discs of spherical lenses and devices for limiting relative movement of components of the retinoscopic apparatus. Alternatively, the apparatus may include a scale graduated in suitable units for determining the patient's optical error.

Abstract: A haploscope has a housing defining left and right viewing apertures disposed to permit substantial alignment with a subject's left and right eyes and permit viewing through the housing. Projection light sources for projection of left and right images are provided and the housing defines first and second light source apertures for transmission of light from the sources therethrough. The haploscope has first and second projection devices for projecting images using the light passing through respective ones of the first and second light source apertures. The housing has a rotary disc and a motor for rotating the rotary disk within the housing at a position permitting occlusion of the first and second light source apertures and the left and right viewing apertures. The rotary disc has at least one viewing aperture disposed to align with the left and right viewing apertures during rotation of the rotary disc such that only one of the left and right viewing apertures is not occluded at a given time.

Abstract: An apparatus for testing visual acuity, or clearness of vision, particularly when there is impaired refracting medium in an eye, includes a lamp (1) and a pin-hole diaphragm (4) arranged in a light-beam path downstream of the lamp with a single diffraction grating (6), being provided in the light-beam path downstream of the pin-hole diaphragm.

Abstract: An optical device comprising a lens and an adjustable lens holder which is adapted to be positioned on an existing slit lamp biomicroscope such that the lens may be selectively positioned in the path of the illuminating light beam from the slit lamp light source. In one embodiment of the invention, the adjustable holder is designed to be rotatably positioned in association with the slit lamp light illumination apparatus and in relation to the projecting or objective lens of the slit lamp illumination system. The lens holder is designed to pass a narrowed zone on support structures associated with the light illumination apparatus and to frictionally engage a portion of the support structure while allowing rotation of the lens into and out of the path of the illuminating light beam.

Abstract: This invention provides a corneal shape measuring apparatus that can correctly measure the shape of the cornea of a subject's eye from an image of a target reflected by the cornea even if the optic axis of a hand-held indicator is inclined with respect to the optic axis of the measuring system when measurements are made. A computing control circuit computes the inclination with respect to the measuring optic axis of an indicator plate from the shape of a guide hole in the indicator plate which had previously been input and the shape of the image of the guide hole, and corrects the image of the indicator reflected by the cornea of the subject's eye based on this inclination.

Abstract: The phoropter is provided with a rotating knob means for selecting specific types of functions (12,13,14), the angular position being picked up by means of a pulse generator, e.g.

Abstract: This invention concerns a procedure and device for refractometric measurement of the degree of ametropia of a human eye.The device for this invention comprises a light-emitting source combined with a focusing lens, which produces an image of this source on the retina of the eye to be tested, a succession of test lenses which are placed in turn between the eye and the focussing lens, so that the optical axis of the relevant test lens coincides with the optical axis of the eye, and a light-intensity detector placed on this same axis at a fixed distance from the eye, together with means of identifying which test lens causes the detector to emit a signal of minimum intensity.The invention applies to instruments to measure visual acuity, more specifically in handicapped or very young patients.

Abstract: In a preferred embodiment, a portable ophthalmoscope having low-power telescope elements and having an internal source of viewed-field illumination, relies on a patient's focusing properties to inspect the fundus of the eye. A laser-beam source is flexibly coupled to the patient end of the ophthalmoscope viewing axis and, after optical expansion and collimation, is folded into coincidence with the ophthalmoscope axis. A dichroic (filter) is the mirror via which the folding takes place, the filter being selected for a very narrowly limited spectral band of great attenuation of radiation at the characteristic wavelength of the involved laser, the latter having been selected for its photocoagulating and/or photoablating action on locally afflicted tissues of the retinal, choroid and/or other internal regions of the eye.

Abstract: Method for obtaining cross cylinder-like actions for using the adjusting or aligning measurement known as the cross cylinder method in phoropters for subjective refraction, wherein the spherical and cylindrical lens discs of the phoropter are adjusted in preprogrammed manner to cross cylinder-like lens systems.The set problem is also solved by a phoropter with spherical test lenses and cylindrical lenses arranged on lens discs and which can be introduced into the observation optical path, wherein the motor drives of the lens discs are combined in a program control unit, connected to an operating unit and an indicating unit.