Method and apparatus for measuring the visual acuity of the huma

Details Method and apparatus for measuring the visual acuity of the huma Method and apparatus for measuring the visual acuity of the huma

1995-01-12

1996-09-17

Mai, Huy

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Subjective type

351244, 351246, A61B 302, A61B 300

Patent

active

055573525

ABSTRACT:
A method and apparatus are provided for measuring the visual acuity and refraction of the human eye during and immediately after ocular surgery. The method includes supporting a measuring means anterior to, and in line with the visual axis of, the eye and measuring the visual acuity of the eye using patient responses to visual prompts. The apparatus includes an elongate housing having an ocular aperture. A collimating lens is positioned within the housing adjacent to the ocular aperture and a resolution target is located above the collimating lens. A light source is used to illuminate the resolution target. The distance from the collimating lens to the target is adjustable, and refractive shift is indicated.

REFERENCES:
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patent: 1747844 (1930-02-01), Ritholz
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patent: 3664631 (1972-05-01), Guyton
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patent: 4679921 (1987-07-01), Yamada
patent: 5455645 (1995-10-01), Berger et al.
Edmund Scientific, Off-the-Shelf Optics & Components for OEM and Research Applications, #14N7.
Seller Instrument, Dioptometer, PN 7680631.

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