Ocular parameter measuring device

Details Ocular parameter measuring device Ocular parameter measuring device

1983-12-20

1986-05-27

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

045912467

ABSTRACT:
A device (1) for measuring the ocular parameters of a subject is of conventional optical design, with a front panel (10), a convergent lens (11), an aiming hole (12) at the focus of the lens (11), and a light source (13) whose image in a semi-reflecting mirror (14) appears as a point at infinity. Liquid crystal matrixes are disposed in windows (15, 16, 17, 18) and controlled by a logic unit (20) connected to a control keyboard (21) and a display (22). Looking through the hole (12), the operator uses the keyboard (21) to send address signals from the logic unit (20) either to the columns of the top matrixes (15, 16) or to the lines of the top and bottom matrixes (15, 16, 17, 18). According to the operating modes selected, vertical lines appear in the top windows (15, 16) to measure the interpupillary distance or horizontal lines appear in all four windows for centering the lenses in the frame.

REFERENCES:
C. Perrot, "Les Cristaux Liquides au Service de la Securite Routiere", Electronique & Microelectronique, No. 228, Nov. 15, 1976, pp. 39-41.

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