Abstract: A prescription lens attachable to a safety glass frame. The safety glass frame is provided with a single lens, a center cross pin and indentation on an inner surface of the safety glass frame juxtaposed the temple pivot pin. A prescription frame includes separate prescription lenses and a central clip that clips onto the cross pin of the safety glass frame. The outer ends of the prescription frame are provided with angular locking ends that are pressed into the indentation on the safety glass frame. Thus, the prescription lens frame is held securely onto the safety glass frame between the safety glass frame and the persons eyes. Damage to the safety glass lens or frame necessitate replacement of only the non-prescription safety glasses because the prescription frame can be removed from the damaged frame and secured to a new safety glass frame.

Abstract: Adjustable size protective eyewear in the form of visitor safety spectacles have a moveable or adjustable hinge pin coupling between the temple sidebars and the lens frame. An opening in each side of the lens frame contains multiple hinge pin sockets which are aligned at an angle with respect to the lens frame such that movement of the hinge pins from socket to socket not only increases the distance between temple sidebars but also the effective length from the lens frame to the ear piece of the temple sidebar. This arrangement allows a single pair of adjustable safety spectacles to be used by a person of a given head size with the adjustability to fit over the user's prescription eyewear where the user requires the prescription eyewear in addition to the safety spectacles.

Abstract: A lamp projecting a high-intensity optical beam of spectral radiation, with an IR-extracting (cooling) array including an IR-dissipating "black-box" arranged to receive IR and convert it to box-heat, plus an IR-diverting "hot-mirror" interposed along the beam to divert (only) the IR to this "black-box".

Abstract: The present invention provides a dual temple system, useful in eyewear frames, having in combination a paddle temple member and a cable temple member. Eyewear frames having a pair of dual temple systems are also provided.

Abstract: The present invention relates to an eye examining apparatus used in ophthalmic clinics. In an eye refractometer provided with a light beam separating member for separating an eye fundus illuminating light beam and an imaging light beam through an objective lens in a position conjugate with the pupil of an eye to be examined, an eye refraction measuring light beam is projected to the fundus of the eye to be examined through an optical passage dividing member arranged between the aforesaid objective lens and the aforesaid light beam separating member in order to obtain the refractive value of the eye to be examined by receiving the aforesaid measuring light beam including at least three meridians using a photoelectric sensor.

Abstract: An eyewear hinge system comprising a front frame with a generally "T" shaped member extending sidewardly on opposite ends thereof and two temple members having means for frictionally gripping and holding the "T" member.

Abstract: An attachment for eyeglass frames which permits the wearer to quickly replace lenses without the use of optical hand tools or equipment, and which does not require the dexterity usually associated in working with miniature optical parts. The invention is permanently affixed to the eyeglasses, eliminating the possibility of loss, damage or disconnection. The invention is designed for use in instances where changing light conditions necessitate the need for tinted or sunglasses but where carrying additional frames is neither practical or desireable.

Abstract: An apparatus for photographing an endothelium of a cornea comprising an apparatus optical system including an anterior portion observing optical system for observing the anterior portion of an eye to be tested, an illumination optical system for illuminating the cornea of the eye, and an observing or photographing optical system for observing or photographing the endothelium of the cornea by receiving the light reflected on the endothelium of the cornea which is illuminated by the illumination optical system, the apparatus optical system being provided with a fixation mark light projecting system capable of changing a position where a fixation mark is presented, in order to change a direction in which the eye is fixedly gazed.

Abstract: A diffractive and a refractive microlens component are combined into a doublet lens to obtain imaging properties that are improvements over those achievable using separate components. In one application, diffractive/refractive microlens arrays are arranged to provide a free-space optical permutation interconnect arrangement.

Abstract: This invention relates to an optical member made of highly transparent, high-purity synthetic silica glass, to a method for manufacturing a blank or an optical member of such glass, and to the optical members themselves. The optical members have an absolute refractive index, n.sub.d, of 1.460 or more and a hydrogen molecule concentration of at least 5.times.10.sup.16 molecules/cm.sup.3 uniformly distributed throughout the glass and are particularly well suited for use in apparatus in which they are exposed to a high-power laser beam such as that produced by an excimer laser.

Abstract: A real image type of variable power view finder is disclosed which has an objective lens system, an image erecting optical system, and an eyepiece lens system, located in this order as viewed from an object to be photographed. The objective lens system includes negative and positive lens groups located in this order from the object side, so as to vary the distance therebetween, to change the magnification. The negative lens group of the objective lens system has at least two negative lenses.

Abstract: The invention is a band hinge for flexibly connecting the temple member to the lens frame thereby preventing damage from inadvertent pressure or cyclic wear. A distinguishing feature of the invention is the use of a band hinge that holds together the temple member and the lens frame without the use of a pin or screw hinging mechanism. The invention allows for a high degree of freedom of movement for the temple member with respect to the lens frame which will prevent most forms of damages to the glasses from these types of events.

Abstract: This specification discloses a method of dividing a radiation beam into a first beam and a second beam differing in color from each other, modulating the first and second beams to thereby form first and second modulated beams indicative of images differing in color from each other, and projecting the images by the use of the first and second modulated beams. The radiation beam is divided into the first and second beams by a hologram.

Abstract: A connecting structure for connecting a glasses temple with a glasses frame is disclosed. The connecting structure includes a hinge means composed of a first hinge member and a second hinge member, a U-shaped resilient member, a compression spring and a rivet pin, wherein the first hinge member is fixed on one side of a glasses frame and pivotally connected with the second hinge member by a screw. The second hinge member is formed with a rear shaft hole and the rivet pin has a head portion and a shaft portion. The U-shaped resilient member has two slightly outward stretched free ends and is disposed at a rear end of the second hinge member.

Abstract: An ophthalmic instrument provided with an eye fundus measuring portion 1 for finding a position of the eye fundus of a patient's eye includes a transducer 11 for outputting a heartbeat signal corresponding to the heartbeat of a patient, a vital signal generating circuit 13, a synchronizing circuit 14, and a timer 16 each for actuating the eye fundus measuring portion 1 synchronously with the heartbeat signal.

Abstract: In order to provide an optical element with an aspheric surface, as well as a process by which the optical element can be mass-produced with high efficiency and consistent precision, the improved optical element with an aspheric surface includes a glass substrate and an overlying light-transmissive resin layer worked to have an aspheric surface. This optical element can be produced by molding a light-transmissive resin composition as it is cured between a glass substrate and a mold having an aspheric surfaced shape. The preferred light-transmissive resin has a Rockwell hardness of 40-80 on the M scale at -40.degree. C. to 60.degree. C.

Abstract: A pattern ERG (PERG) projector includes a coherent light source (32) for generating a projection beam, modulation optics (34) for modulating the projection beam with an alternating ERG interference pattern with a selected spatial and alternation frequency, and wide angle imaging optics (36) for focusing the projection beam such that it passes through the pupil, and then diverges to project onto a selected portion of the retina.

Abstract: A binocular ophthalmoscope having a pair of eyepieces that are mounted in a frame and arranged to view a target area in the eye through a pair of angularly offset reflecting surfaces. The reflecting surfaces are seated on a carriage that is mounted for reciprocation in the frame. A mirror is pivotally mounted in the frame and arranged to direct a beam of light at the target area. A camming mechanism connects the mirror and the carriage so that the axis of the light beam and the axes of the image paths to the reflecting surfaces all move closer together as the carriage moves in one direction and moves further apart as the carriage moves in the opposite direction.

Abstract: A method for visualizing the choriocapillaris of the eye in a sequence of ICG angiographic images comprising subtracting each image in the angiographic sequence from a succeeding image. In practice, a modified fundus camera is used to provide digitized images which are subtracted pixel by pixel. To better visualize aberrant vascular structures such as choroidal neovascularization (CNV), a fundus camera is modified with a polarizing filter in front of the light source and an analyzing polarizer in front of the video camera. This results in the suppression of unwanted scattered fluorescence to the extent that the CNV can be better visualized. To assist the surgeon in treating aberrant vascular structures with laser photocoagulation therapy, a fundus camera is provided with two light sources and two barrier filters operating synchronously to produce and pass two different fluorescences thereby generating precisely superimposable angiographs to aid in aiming the laser.

Abstract: In optical, microwave, acoustical and other wave fields diffraction spreading and loss of gain is countered by giving the wavefront approaching an aperture a bevelled lip or edge, whereby the radiation spreading inwards from this edge prevents the outward diffraction spreading of the field, and where any aberrations resulting from the de-diffraction process are corrected by methods analogous to those used to correct for spherical aberrations, the result of these adjustments being to cause a field such as that emitted by a lens or laser, to emerge free from diffraction spreading, gaining in resolution beyond the diffraction limits.