Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – For interpupillary distance measuring or lens positioning
Patent
1982-04-13
1985-01-22
Bovernick, Rodney B.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
For interpupillary distance measuring or lens positioning
33200, A61B 310
Patent
active
044948360
ABSTRACT:
The invention provides a simple and accurate device for determining and/or measuring monocular pupillary deviations in a patient's eyes that is, the distance in normal distant or near sight between the center of the pupil of each eye and the plane of virtual symmetry of the patient's face. The device comprises a cross bar carrying two adjustable reticles; the bar is formed of two casings which can move telescopically in relation to each other and each of which contains a runner capable of moving inside it under the control of an outside regulating knob and connected to a removable reticle-holder pin, each said telescopic casing comprising a downward-pointing arm held against the corresponding inside or outside surface of one of the arms of the spectacle frame, by at least one spring exerting force on each casing, the aforesaid device being characterized by the fact that each casing comprises an internal extension enabling the two casings to fit telescopically inside each other and which includes a supporting device for one end of a compression spring so that the force of the spring causes the casings to move away from each other and presses the downward arms against the inside surface of the spectacle arms.
REFERENCES:
patent: 2596264 (1952-05-01), Macbeth
patent: 4252419 (1981-02-01), Padula et al.
Bovernick Rodney B.
Essilor International
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