Vision tester

Details Vision tester Vision tester

2011-01-25

2011-01-25

Hasan, Mohammed (Department: 2873)

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Subjective type

C351S239000

Reexamination Certificate

active

07874676

ABSTRACT:
A subjective vision tester includes a pair of right and left lens chamber units (2) each having a test window (4), a first lens disk (11-14) provided with an aperture and a plurality of optical elements (110, 120, 130, 140) and placed in a position closer to an examinee's eye (E) within the each lens chamber unit, and a second lens disk (15, 16) provided with an aperture (151, 161) and a plurality of optical elements (150, 160) and placed in a position farther from the examinee's eye than the first lens disk within the lens chamber unit. The first lens disk and the second lens disk are equal in diameter. The diameter of the diameter of the aperture in the second lens disk is larger than each optical element in the first lens disk.

REFERENCES:
patent: 3891311 (1975-06-01), Fletcher et al.
patent: 4844607 (1989-07-01), Andera et al.
patent: 5812241 (1998-09-01), Doms et al.
patent: 5929971 (1999-07-01), Hosoi et al.
patent: 6923541 (2005-08-01), Hosoi et al.
patent: 2003/0081175 (2003-05-01), Hosoi et al.
patent: 2004/0130679 (2004-07-01), Hosoi
patent: 2007/0052924 (2007-03-01), Nozawa et al.
patent: 296 00 127 (1996-04-01), None
patent: 1 308 123 (2003-05-01), None
patent: 1 442 697 (2004-08-01), None
patent: A-64-20824 (1989-01-01), None
patent: U-05-48902 (1993-06-01), None
patent: A-09-505209 (1997-05-01), None
patent: A-10-014872 (1998-01-01), None
patent: A-2001-346762 (2001-12-01), None
patent: A-2003-135397 (2003-05-01), None
patent: A-2003-135398 (2003-05-01), None
patent: A-2004-208705 (2004-07-01), None

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