Retinal acuity testing device

Details Retinal acuity testing device Retinal acuity testing device

1981-03-03

1983-10-18

Rosenberger, R. A.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

3501622, 351222, 356354, A61B 310

Patent

active

044102445

ABSTRACT:
Optical measuring and testing apparatus incorporating 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. In one embodiment, elements are repositioned to move the light source with respect to the grating thereby to alter the number of fringes in a given area. In another embodiment, elements are rotated about the optical axis of the apparatus to control the orientation of the fringe pattern. Provision is also made for allowing the examiner to view the patient's eye pupil during testing.

REFERENCES:
patent: 3468609 (1969-09-01), Sterrett et al.
patent: 3787117 (1974-01-01), Watkins
patent: 4009940 (1977-03-01), Ohzu
patent: 4025197 (1977-05-01), Thompson
patent: 4125320 (1978-11-01), Rassow et al.

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