Visual function examination apparatus including binocular fixati

Details Visual function examination apparatus including binocular fixati Visual function examination apparatus including binocular fixati

1995-07-19

1997-05-13

Dang, Hung X.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Subjective type

351237, 351239, 351243, A61B 302

Patent

active

056297483

ABSTRACT:
A visual function examination apparatus, comprising an optotype presenting device for presenting optotypes for use in examinations of visual functions of examinee's eyes, for examining visual functions of the eyes by delivering luminous flux via reflecting system from the optotype presenting device, wherein the optotype presenting device is provided with optotypes for examinations to be carried out as the examinee opens his both eyes, the optotypes having polarizing plates, and a binocular fixation target which should become fusion impulse to binocular vision is disposed around the optotypes for examinations.

REFERENCES:
patent: 4298253 (1981-11-01), Tagnon
patent: 4753527 (1988-06-01), Ishihara
patent: 5444504 (1995-08-01), Kobayashi et al.

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