Optometric apparatus

Details Optometric apparatus Optometric apparatus

1997-09-12

1999-01-05

Dang, Hung Xuan

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Subjective type

351222, A61B 302

Patent

active

058568611

ABSTRACT:
An optometric apparatus which makes it possible to efficiently perform the masking operation for presenting a target. The optometric apparatus for examining the visual acuity of an eye to be examined by presenting a test target, includes: target presenting device for presenting a target to a predetermined presenting plane after a multiplicity of visual-acuity testing targets are divided into a plurality of sets of targets; masking device for masking a screen of the target presented by the target presenting device; a mask selection key for selecting a kind of masking by the masking device; a move key for moving a selected masking position, at least a portion of the move key being used jointly as the mask selection key; a change key for changing a masking state and used jointly with the mask selection key; and controlling circuit for controlling the kind and position of masking by the masking device on the basis of a combination of input by the change key and the mask selection key or the move key as well as the screen of the target presented by the target presenting device.

REFERENCES:
patent: 5416540 (1995-05-01), Hayashi
patent: 5444504 (1995-08-01), Kobayashi et al.
patent: 5610671 (1997-03-01), Hosoi et al.
patent: 5627612 (1997-05-01), Hayashi

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