Abstract: A holographic full-color, data retrieval and projection system includes a holographic information storage plate that includes a plurality of reflective holograms, each designed to diffract light over a certain spectral bandwidth, and a holographic screen character plate, which includes a plurality of screen hologram character shapes that reflect diffracted light in a uniform, well-defined cone of diffuse light directed toward the viewer, producing images having high screen gain and high brightness, yet with lower power consumption than heretofore obtained.

Abstract: A real-time dynamic holographic image storage device uses four-wave mixing in a pair of photorefractive crystals. An oscillation is produced between the crystals which can be maintained indefinitely after the initial object beam is discontinued. The object beam produces an interference patORIGIN OF THE INVENTIONThe invention described herein was made by employees of the United States Government and may be manufactured and used by or for the Government for governmental purposes without the payment of any royalties thereon or therefor.

Abstract: A sharpening stone holding device is for supporting a plurality of sharpening stones. The device is adjustable for holding stones of different lengths.

Abstract: Embossed holograms or diffraction patterns are formed on hard, unembossible metal substrates such as steel sheet metal. The hard metal substrate has a soft embossible metal layer such as tin formed on it, and holograms are embossed thereon by means of a surface relief, metal master. The soft metal layer must be sufficiently thick to accommodate the deepest surface relief pattern. For tinplate, the embossing can be preformed at room temperature. Among other things, the process produces tinplates and tin cans with embossed holograms.

Abstract: The specification discloses a diagnostic device and method for detecting various neurological conditions, particularly dyslexia. Eye movement patterns of the subject to be tested are separated into saccadic movement (both progressive and regressive) vergence, pursuit movements and fixations, and the subject's specific eye movement pattern, as evaluated against a specific stimulus, and normal patterns is used for diagnostic purposes. A variety of eye movement detectors is disclosed, together with a sampling means which evaluates the eye position at intervals of less than 10 milliseconds. A data processing means is used to isolate the significant samples and categorizes the retained data samples into the foregoing eye movements. The eye movement patterns are then evaluated against a statistical data base to determine the kind and severity of the diagnosed condition.

Abstract: A visual acuity testing device and method of preparing same are provided, the device being in the form of an optotype as well as a series of optotypes of the same nature, each of which is defined according to a rectangular optotype gridwork including a plurality of rectangular unit areas of contrasting colors or differing contrast properties that are varied in coloration or contrast as desired in order to form a set of optotype characters that exhibit similar peripheral shapes that vary from one another to define readily recognizable optotype characters.

Abstract: A fixation sight apparatus for an ophthalmological instrument is disclosed. It has a unique arrangement including light source and mirrors for presenting a plurality of fixation mark images on a measuring optical axis. An eye to be tested selectively fixedly gazes at the most clearly sightable one among the plurality of fixation mark images according to the sight confirmation characteristic thereof.

Abstract: An auxiliary earpiece is disclosed that is positively, adjustably, and removably attachable to an eyeglass bow with the aid of an insert. The earpiece includes an ear-engaging portion and a bow-receiving portion through which the bow is passed. The insert includes a wedge-like section that is positioned within the bow-receiving portion of the earpiece adjacent one side of the bow. By appropriately positioning the insert with respect to the bow-receiving portion of the earpiece, an interference fit is produced between the bow, the insert, and the earpiece to provide the desired attachment. The resultant side-to-side clamping works well with a wide variety of eyeglass frames making the earpiece relatively interchangeable among eyeglasses.

Abstract: The specification discloses a diagnostic device and method for detecting various neurological conditions, particularly dyslexia. Eye movement patterns of the subject to be tested are separated into saccadic movement (both progressive and regressive) vergence, pursuit movements and fixations, and the subject's specific eye movement pattern, as evaulated against a specific stimulus, and normal patterns is used for diagnostic purposes. A variety of eye movement detectors is disclosed, together with a sampling means which evaluates the eye position at intervals of less than 10 milliseconds. A data processing means is used to isolate the significant samples and categorizes the retained data samples into the foregoing eye movements. The eye movement patterns are then evaluated against a statistical data base to determine the kind and severity of the diagnosed condition.

Abstract: An attachment for a slit lamp that permits the operator to view the superimposition of an image of a patient's eye and a second image that may comprise a fluorescein angiogram or other photographic image of the patient's eye, or an image formed by a CRT or other display system. The slit lamp includes an objective for forming the first image directed along a first optical path, an eyepiece, being attachable to the objective such that the eyepiece is positioned along the first optical path. The attachment includes a body, a beamsplitter, and an image forming system. The body includes an attachment for attaching the body between the objective and viewing means, and also includes a passage through which the first image can pass along the first optical path to the eyepiece. The beamsplitter is mounted in the body, and positioned in the first optical path. The image forming system projects the second image onto the beamsplitter, such that a portion of the second image is reflected along the first optical path.

Abstract: Glare testing apparatus enclosed in a housing includes multiple discrete light sources for creating a glare condition in the field of view from an individual being tested to a target, and provision is made for selecting the location or locations of active glare sources, which includes a centrally located source of headlight glare, and a plurality of peripheral sources which can be energized selectively or collectively. Provision is also made for adjusting target luminance, glare intensity and the apparent distance between the target and the eye position in order to test near and far visual acuity under varied conditions of luminance and glare.

Abstract: A device for causing concentric circles of illuminated light to be reflected from the human cornea. The device includes a cylindrical surface which is open at both ends. At one end the eye looks into the cylinder of the device and at the other end a camera or observer can view the illuminated rings on the cornea. The cylinder is advantageously made of transparent plastic or glass having an opaque coating. A lamp box is affixed to an uncoated portion of the device. The coating of the cylindrical surface through is interrupted to define clear rings on the cylindrical surface which light from the lamp box is conducted to be reflected from the cornea.

Abstract: An eye shield that effectively blocks ultraviolet rays is incorporated in a pair of ordinary eyeglasses. The eye shield comprises a combination of a coating or layer of light blocking material on the inner surfaces of the eyeglass lenses and a coating or layer of light reflecting material on the outer surfaces of the eyeglass lenses. This combination of light blocking material and light reflecting material results in zero light transmission through the eyeglass lenses.

Abstract: A method and system for generating a dynamic, real time synchronized display of individual visual fixation points of one or more viewers superimposed on a video taped visual presentation for subsequent evaluation to assess the effectiveness of such visual presentation in communicating information.

Abstract: A mounting apparatus for mounting the pilot's display unit for a head-up display system in an aircraft cockpit affords a stowage position for the display unit which does not restrict the pilot's movement or obscure his vision, and further provides ease of transition between the operating and stowage positions. The mounting apparatus provides a crash-release feature which permits the pilot's display unit to breakaway forwardly upon impact and to be constrained in a forward position to prevent the display unit from rebounding violently rearwardly toward the pilot's head. The mounting apparatus further provides a quick-replacement capability which permits fast and easy removal and installation of the pilot's display unit with a minimum of tools and no need for realignment.

Abstract: An attenuated fiducial replica of the far field pattern of a high energy laser beam is obtained by a system and method wherein a first fraction of an incident high energy beam is deflected from one reflective surface of a holey plate and the diffracted orders of the beam are transmitted from the holes to a concave reflector, which reflects diffracted orders toward an opposite reflective surface of the holey plate. A zinc selenide partially reflective member is disposed on-axis between the rear reflective surface and the concave surface for re-reflecting successive fractional portions of the reflected beam a selected number of times to attenuate the beam converging upon a focal plane from an effective focal distance greater than the physical length of the optical system.

Abstract: A clip body having a pair of vertical tabs, arranged in parallel facing relationship and having a transverse pin is employed as an attachment member for a temple bracket or hinge bracket connecting an earpiece to a plastic eyeglass frame. The clip is molded in situ together with the formation of the plastic frame, so that the plastic material embeds the clip and especially the pin.

Abstract: An ophthalmological measuring apparatus having a laser-slit projector unit for projecting a laser beam on a portion in a human eyeball, a microscope unit adapted for receiving and observing the light reflected from the portion in the eyeball and a detector unit adapted for displaying the observing point in the eyeball projected by the laser beam.

Abstract: An improved eye refractive power measuring apparatus is disclosed. The apparatus includes a measurement system for projecting a measurement target image to the retina of an eye to be tested and measuring the refractivity of the eye to be tested by detecting the focussing state of the measuring target image. In addition, it has an eye position detection system for detecting a shifted amount from a proper position of the eye to be tested and an arrangement for correcting a measurement result of the eye refractivity based on such detected result.

Abstract: A vision tester having a casing horizontally adjustable with respect to a base. Inside the casing a rotating drum has a first end rotatably fixed to the casing and a second end unconnected to the casing and having an open portion. An illumination device is removably mounted to the casing and inserted inside the rotating drum through the open portion. The illumination device provides illunination to a plurality of test slides mounted to the surface of the rotating drum. A viewing device is mounted to the casing and provides left and right lenses simulating a far vision of the illuminated test slide. A pair of near vision lenses is rotatably mounted inside the viewing device and may be rotated to overlap the far vision lenses to simulate a near vision of the test slide. Peripheral vision is tested by light provided from an illumination source through fiber optic cables to peripheral vision test locations on the viewing device.