A support for an ophthalmic refracting instrument includes a vertical support column preferably comprised of a pair of closely spaced upright members. A rigid horizontal support member has one end secured to the top of the vertical support column. The free end of the support member extends to the vicinity above and in front of the patient's chair. The support member includes an elongated horizontally extending bar therein. The refracting instrument is mounted on a bar carried by a slide assembly...

An optical device having a semi-spherical or hemispherical field-of-view is provided. A conically-shaped piece of optical material has an annular surface satisfying Snell's Law for total internal reflection with respect to light passing through the piece and incident on the annular surface from within the piece.

A fixture for use in refracting an aphakic eye over a properly patient fitted spectacles frame glazed with major spherical component lenses and placed in a position of use upon the patient. The fixture, having trial lens holders for right and left eye refraction, is attached to rims of the spectacles frame for establishing parallelism of the holders with the frame and provision is made for separately adjusting each right and left eye lens holder vertically and horizontally as needed for centerin...

An ophthalmic refracting chart projector with rotary slide discs having removable slides. Operating controls permit selective showing of slides in a desired sequence. Astigmatic charts may also be turned on their axes by such control.

An optical device having a semi-spherical or hemispherical field-of-view is provided. A conically-shaped piece of optical material has an annular surface satisfying Snell's Law for total internal reflection with respect to light passing through the piece and incident on the annular surface from within the piece.

Eyeglasses equipped with liquid lenses having adjustable refractive power that depends on the amount of liquid forced into each lens. An electrically powered pump and an electronic controller regulate the liquid input to the lenses in response to a signal determined by the focal length required for viewing a given object in the field of vision. This focal length is determined by the use of a rangefinder mounted on the frame of the eyeglasses. The system is programmed for automatic response tailo...

An apparatus for refracting the eye utilizes two separate optical paths to minimize stray light and optical interference. The apparatus includes dual lens means, each disposed along one of the optical paths, for selectively varying the spatial relationship of a beam of radiant energy passing therethrough. The apparatus comprises a source of radiant energy, modulating means for forming a modulated beam of radiant energy, first lens means, projecting means for introducing a portion of the beam int...

Apparatus is provided to project a pattern of bars of light through a lens system into a subject's eye. The reflection of the pattern from the retina of the eye is passed back through the lens of the eye and through a second pattern system to a detector. The pattern of bars of light is continuously moved back and forth axially of the subject's eye to bring the pattern into focus on the retina once during its travel from one extreme to another. The second pattern system through which the reflecte...

A compound prism having an even number of doubly refracting component prisms having equal or substantially equal refracting angles. The component prisms are arranged one behind another so that for each face inclined to the axis of the system, there is a second face whose inclination to the axis of the system is opposite to that of the first face, the angles of inclination being equal to each other. The refracting angles are turned in regular order of succession through 180.degree. relative to ea...

A lamp fixture having a top housing with slightly slanted side walls, a faceted rectangular glass portion extending from the housing and held affixed to the housing by a door, and a junction box and an extrusion plate for mounting the fixture to an electrical or junction box in a building. The extrusion plate is mounted to a sidewall of the housing. The extrusion plate includes J or hooked shaped end portions forming cavities therein. The junction box includes ridges. The ridges are slightly ang...