Optical device for measuring the position of the main or other d

Details Optical device for measuring the position of the main or other d Optical device for measuring the position of the main or other d

1987-03-19

1989-06-13

Bovernick, Rodney B.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

For fusion and space perception testing

351204, A61B 310

Patent

active

048386766

ABSTRACT:
An optical device can be fitted in front of a patient's eyes and comprises a holder (1) bearing two movable screens (2, 3) of transparent polarizing material. The two screens (2, 3) are moved in front of the eyes, and their position relative to the holder (1) of the device is determined. A target is separated from the holder and is adapted to be placed in front of the patient so as to be visible to the latter, a central part of the target having a polarization axis perpendicular to that of the polarizing screens (2, 3). Each polarizing screen (2, 3), near its lateral edge (2a, 3a) nearest the axis of symmetry (Y, Y') extending between the two screens, has a slot (5a, 6a) substantially parallel to the aforementioned axis of symmetry, whereas near its bottom edge (2b, 3b) it has a slot (5b, 6b) substantially perpendicular to the previously-mentioned slot. The two screens (2, 3) are moved in such a way that the slots (5a, 6a; 5b, 6b) in the screens remain parallel to themselves when the screens move.

REFERENCES:
patent: 4208800 (1980-06-01), Grolman et al.
patent: 4368958 (1983-01-01), Buget

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