Abstract: A side glare device for attachment to a temple-bar of eyeglass frames and similar mounting structures, having a first glare shield member and a second glare shield member with overlapping surfaces for adjustment relative to each other along a common plane to vary the amount of light, and in particular sunlight, transmitted to the eyes of the wearer of the eyeglass frames from a lateral peripheral direction, means for coupling of the first and second members with respect to one another to permit relative positionment of the second member with respect to the first member along the common plane is provided. Means for permitting removable adjustable positional securement of the first member on the temple-bar for maintaining the device at the desired position upon the temple-bar, and means for positionally adjusting the angular orientation of the device with respect to said temple-bar from a raised elevation to a lowered elevation, is also provided.

Abstract: Apparatus and method provide for automatically measuring the refractive error of a subject's eye and thus the prescription for lens or eye glasses for correcting this error. Under the control of a programmed automatic data processing system, an objective refraction measurement is made. Test symbols are then alternately presented to the subject under control of the data processing system. The symbols are viewed by the subject through an optical system whose refractive power may be continuously varied under control of the data processing system. The initial setting of the optical system is based upon the objective refraction measurement. The data processing system varies the size of the symbols presented to compensate for the power of the optical system so that a given symbol will appear to the subject to be of constant size.

Abstract: A multi-element photographic lens has a strongly aspheric surface formed on a strong lens element that is movable relative to the other elements along a common optical axis. The aspheric surface corrects at least the lower order aberrations contributed by the movable element thereby allowing the movement to focus the lens over a wide focus scale or object distance. Preferably, the elements are formed of plastic, the movable element is a front element, and at least one other aspheric surface is formed on a lens element.

Abstract: The spectacle frame includes a frontal lens support incorporating a nose bridge, a pair of temples, and hinges connecting each temple to an outer end of the lens support. A blind bore or socket is formed in either the lens support or the temple at at least one outer end of the lens support. A sleeve assembly, including an internally threaded sleeve and an externally threaded adjusting rotor member, is inserted in each socket. The adjusting rotor member has an outer end engaging the other of the lens support and the temple. The sleeve has a length less than the depth of the associated socket, and is formed with a flange on its outer end limiting forcing of the sleeve into the socket, under pressure, to a depth in which the flange is flush with the surface of the lens support or temple in which the bore or socket is formed.

Abstract: The present invention relates to a zoom lens comprising four groups, the first group from the side of the object to be photographed presenting a positive refraction power, consisting of a positive compound lens of a negative and a positive lens and of a positive lens seen from the side of the object to be photographed and movable at the time of focussing, the second group presenting a negative refracting power and movable largely forth and back at the time of zooming, the third group presenting a positive refraction power and movable to and from in functional engagement with the second group at the time of zooming, whereby the first, the second and the third group almost composing an afocal system, and the fourth group presenting a positive refraction power and the image forming effect and consisting two positive lenses, a negative lens, a positive lens and a positive compound lens of a positive and a negative lens.

Abstract: A concentric self-conjugate optical system of substantially unit power is improved by altering the relations among the concentric spherical surfaces of the system to produce a circular locus of points of zero tangential aberration at a distance from the optical axis. The self-conjugate system is also improved by the incorporation of a novel concentric plano-convex triplet lens. The image and object planes of the concentric self-conjugate system are divorced by the use of prisms. The concentric system with divorced image and object planes is improved by the incorporation of a concentric doublet lens or by the incorporation of a novel concentric plano-convex triplet lens. The concentric system with its divorced image and object planes can also be modified to produce in the divorced image and object planes loci of points of zero tangential aberration.

Abstract: The present invention relates to an eye fundus camera free from undesired reflected and diffused light beams. The camera uses a photographic optical system including an objective lens, a reflecting means, an aperture means, a photographic lens system for imaging the eye fundus to be inspected in sequence on a photographic plane and an illumination optical system including at least a light source, a relay lens and a ring-shaped aperture. The optical system leads the light beam from the light source to the eye to be inspected through the reflecting means and the objective lens, whereby the ring-shaped aperture is positioned in the illumination optical system in such a manner that the image of the ring-shaped aperture is formed near the iris in the eye to be inspected while the aperture is positioned in such a manner that the conjugate position of the aperture with reference to the objective lens is near the cornea to the eye to be inspected.

Abstract: A rimless spectacle including a light weight two member lens supporting nose bridge assembly which engages the brow bar at its upper end and includes a pair of nose engaging pad members extending from its bottom end.

Abstract: A slit lamp microscope includes an illumination light source from which light is passed through two separate optical paths to the patient's eye. The first of the optical paths includes a slit mask and a projecting lens so that the light is focused on the patient's eye to provide a bright slit-like illumination. The light which has passed through the second path provides a uniform auxiliary illumination around the illuminated slit area so that the location of the area can be readily determined with respect to other portions of the patient's eye.

Abstract: A low magnification microscopic objective comprising two components of four elements for which radii of curvature on respective lens surfaces are selected as large as possible and wherein various aberrations are favorably corrected.

Abstract: An ophthalmic device having rim members for securing a pair of primary lenses thereto for distant vision, the upper portion of the rim members being located above eye level when worn, at least one pair of auxiliary lenses being tensionally and releasably attached to the device in a piggy-back arrangement, and extending over the primary lenses, preferrably over the rear thereof, and of such a prescription so that the prescription of the combined lenses, primary and auxiliary, provides a bifocal or multifocal lens arrangement, the means for releasably attaching the auxiliary lenses to the rim member being a pair of bracket members attached to the side portions of the rim members, at least one of the bracket members being resilient and capable of spring action, so that at least one of the bracket members will yield relative to the other bracket member, the auxiliary lenses having notches formed in the side portions thereof, the bracket members and the notches in the auxiliary lenses being arranged so that the au

Abstract: A varifocal camera objective, having a rotatable control ring for adjustment to a desired focal length in a zoom range and to a closeup position in a macro range, is provided with a pair of independently settable stop members for selectively limiting the adjustability to less than the entire zoom range and for optionally excluding the macro range. The stop members coact with edges of a stepped recess in a rim of the control ring and are each indexable in an advanced and in a retracted position.

Abstract: An ophthalmic device comprising superposed pairs of light polarizing elements, one pair of such elements being fixed and the other pair being rotatable with respect to the fixed pair to provide a variable light transmission feature, both immediately adjacent surfaces of the superposed elements comprising a continuous coating of a hydrophobic material.

Abstract: A focusing part in a wide-angle zoom lens. The focusing section of a wide angle zoom lens is composed, from the object end, of a diverging fixed lens group, a converging movable lens group and a converging fixed lens group. The movable lens group remains stationary during a zooming operation and moves along its optical axis toward an image when focusing from a distant object onto a nearer object. Aberrations remain unvaried even when focusing onto a nearby object. The converging fixed group furnishes a suitably positioned object point for a zooming section arranged behind the focusing section. The converging fixed lens group is composed of a plurality of lenses contributing to improvement in the image quality.

Abstract: This disclosure relates to a Wide Angle Lens of the retrofocus type having a new lens group arrangement which comprises from the object end to the image end a first negative group, a second negative group in the form of a meniscus having a concave image side surface, a third positive group having a convex object side surface, a fourth positive group having a convex image side surface, a fifth negative group, and a sixth positive group having convex image and object side surfaces.

Abstract: Variable power lenses and correcting lenses are integrally moved a prescribed distance toward an object to be photographed without changing a spacing maintained between the two lens groups in ordinary photography, so as to attain the state capable of close-up photography. Said variable lenses and said correcting lenses are caused to perform zooming movement for adjusting the focus for close-up photography.A cam cylinder for moving said variable power lenses and said correcting lenses while keeping a spacing maintained between the two lens groups in ordinary photography is disposed so that said variable power lenses and said correcting lenses are moved linearly a prescribed length in the direction of the optical axis integrally with said cam cylinder toward an object to be photographed without changing the spacing between the two lens groups, so as to attain the state capable of close-up photography.

Abstract: Variable focus lens systems having a fixed divergent lens element, a movable convergent lens component, and a basic objective lens group having a fixed lens element and a movable lens component, the movable lens component of the basic objective lens group being coupled to the convergent lens component for movement therewith in the same direction but over a proportionally lesser distance.

Abstract: An eyepiece lens system having an apparent field of view more than 60.degree. and an eye relief greater than 80% of the total focal length of itself comprises a first lens group, a second lens group disposed rearwardly of the first lens group and a third lens group disposed rearwardly of the second lens group. The first lens group includes a positive meniscus lens component with its convex surface facing rearward, the second lens group includes a cemented positive doublet lens component consisting of a biconvex lens element and a negative meniscus lens element, and the third lens group includes at least a positive meniscus lens component with its convex surface facing forward. The eyepiece lens system satisfies predetermined optical conditions.

Abstract: First and second lenses are spaced apart in a common plane and provide respective first and second recorded representations of radiant energy issuing from an object surface point or region. The first representation is displaced relative to the second in measure depending on such lens spacing to spatially locate the image location of the object surface point relative to the second lens. With lens focal length known and magnification now determinable, object surface point distance outwardly of the lens common plane may be computed. Since the ray from the image location to the second lens node is also spatially located, the object surface point spatial location is defined.

Abstract: An optical micrometer includes circuit means for determining accurately the passage of a scanning beam of light across the edges of an article placed within the zone of measurement. By sensing the half power point of the beam as received by a photodetector, the accuracy of the measurement is made independent of the intensity of the scanning beam. The half power point is determined by comparing the amplitude of the photodetector output signal with its responsive half amplitude value. Since it is not possible to determine half-amplitude value until after full amplitude has been reached, delay means are provided, the amount of delay being determined by the dimensions of the beam and the scanning rate.