Optometry apparatus

Details Optometry apparatus Optometry apparatus

2005-12-15

2008-08-05

Mack, Ricky L (Department: 2873)

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

C351S222000, C351S243000

Reexamination Certificate

active

07407289

ABSTRACT:
The optometry apparatus includes an index projecting optical system for projecting an index for cross cylinder test to an eye for shortening examination time, a variable cross cylinder lens disposed on an optical axis of the index projecting optical system, for forming one pair of projection images of the index by switching of an astigmatic axial angle while predetermined astigmatic power is set, a joystick lever and a button used to input a result of comparison between appearance states of the pair of projection images of the index, and an initial value setting unit for determining an astigmatic axial angle of the variable cross cylinder lens to cause one of the pair of projection images of the index visually recognized and to cause the other thereof in a blurred state based on objective values of astigmatic power and an astigmatic axial angle of the eye, measured in advance, and for setting the determined astigmatic axial angle as an initial value for astigmatic axial angle measurement.

REFERENCES:
patent: 4105302 (1978-08-01), Tate, Jr.
patent: 4523822 (1985-06-01), Thurston
patent: 5420651 (1995-05-01), Kamppeter
patent: 6309068 (2001-10-01), Kohayakawa
patent: 2003/0081174 (2003-05-01), Ross et al.
patent: 1 444 946 (2004-08-01), None
patent: 1444945 (2004-08-01), None
patent: 1444946 (2004-08-01), None
patent: 2004-180955 (2004-07-01), None

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