Optometric apparatus

Details Optometric apparatus Optometric apparatus

2007-04-03

2007-04-03

Dang, Hung Xuan (Department: 2873)

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Subjective type

C351S243000

Reexamination Certificate

active

10624647

ABSTRACT:
An optometric apparatus (1) for subjectively examining a visual function of an examinee's eye, includes: a pair of right and left lens chamber units (5), each including a test window (5a) and optical elements to be changeably disposed in the test window; a support unit (6) which supports the lens chamber units so that the units may be converged; a near vision examination chart (2, 3) to be disposed at a changeable distance from the test window; and an illumination unit (7) which illuminates the near vision chart, the illumination unit being provided in each lens chamber unit.

REFERENCES:
patent: 5220362 (1993-06-01), Blenkle
patent: 5231430 (1993-07-01), Kohayakawa
patent: 5281984 (1994-01-01), Burton et al.
patent: 5485231 (1996-01-01), Hayashi et al.
patent: 5929971 (1999-07-01), Hosoi et al.
patent: U 6-46702 (1994-06-01), None
patent: A 7-236612 (1995-09-01), None

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