Ophthalmic refractor

Details Ophthalmic refractor Ophthalmic refractor

1997-11-10

1999-03-16

Dang, Hung Xuan

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Subjective type

351237, 351243, A61B 302

Patent

active

058836934

ABSTRACT:
An ophthalmic refractor is constructed to judge whether a visual acuity value of a symbol with a mask is minimum or maximum among values in a selected charts, select a chart containing a symbol indicating a visual acuity value smaller than the minimum visual acuity value when the visual acuity value is judged to be minimum, and select a chart containing a symbol indicating a visual acuity value larger than the maximum visual acuity value when the visual acuity value is judged to be maximum.

REFERENCES:
patent: 4714330 (1987-12-01), Hennequin

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