Apparatus for displaying visual acuity chart with constant magni

Details Apparatus for displaying visual acuity chart with constant magni Apparatus for displaying visual acuity chart with constant magni

1997-06-25

1999-05-11

Mai, Huy

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Subjective type

351239, 351243, A61B3/02

Patent

active

059033355

ABSTRACT:
In an apparatus for displaying a visual acuity chart table, in response to the change of the distance between an eye to be examined and an apparatus body, a concave mirror of a visual chart optical system is moved along a desired optical axis direction and a concave lens is inserted in the optical path of the visual chart optical system, so that the forming magnification of the visual chart images of various kinds of visual charts is kept constant. Thus, irrespective of the distance between the eye to be examined of a person to be examined and the apparatus body, the visual chart images of the visual charts having a constant size can be displayed to the eye E to be examined at a constant distance, and an accurate eye examination to the eye to be examined is carried out irrespective of the dimensions of an eye examination space.

REFERENCES:
patent: 5255027 (1993-10-01), Reiner et al.

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