Ophthalmic testing devices

Details Ophthalmic testing devices Ophthalmic testing devices

1983-05-16

1985-09-17

Bovernick, Rodney B.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351205, A61B 310

Patent

active

045416974

ABSTRACT:
Optical measuring and testing apparatus incorporates a holographically recorded, single-frequency, optically thin phase grating. When this phase grating is illuminated by a quasi-monochromatic, spatially coherent light source, it acts as a basic common path interferometer and constitutes a highly efficient source for a high contrast, stable, interference fringe pattern. Various apparatus embodiments incorporating the phase grating are described which permit (1) measurement of central and peripheral retinal acuity, (2) variable contrast testing to measure the ability of the eye to detect low contrast stimuli, (3) measurement of visually evoked responses to help diagnose retinal-neurological dysfunction, and (4) the testing of optical lenses.

REFERENCES:
patent: 4009940 (1977-03-01), Ohzu

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