Hand-held line grid interference retinometer

Details Hand-held line grid interference retinometer Hand-held line grid interference retinometer

1994-05-26

1995-12-26

Sikes, William L.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351211, 351217, 351221, A61B 310

Patent

active

054792215

ABSTRACT:
An apparatus for testing visual acuity, or clearness of vision, particularly when there is impaired refracting medium in an eye, includes a lamp (1) and a pin-hole diaphragm (4) arranged in a light-beam path downstream of the lamp with a single diffraction grating (6), being provided in the light-beam path downstream of the pin-hole diaphragm.

REFERENCES:
patent: 2352500 (1944-06-01), Shepard
patent: 3572910 (1971-03-01), Koester
patent: 4423931 (1984-01-01), Shapiro
patent: 4447141 (1984-05-01), Eisenkraft
patent: 4541697 (1985-09-01), Remijan
patent: 4552440 (1985-11-01), Guydon
patent: 4801198 (1989-01-01), Heacock et al.
Potential Acuidy Meter Using a Minute Aerial Pinhole Aperture; John S. Mirkowski, Ophthalmology, vol. 90, No. 11, Nov. 1983.
Use of Moire Fringes for Testing Visual Acuity of the Retina; W. Lotmar; Applied Optics; vol. 11, No. 5; May 1972.
Bernhard Lachenmayr; Potentielle Sehscharfe Bei Storungen Der Brechenden Medien, 1993, 54-94.

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