Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Subjective type
Reexamination Certificate
2003-08-26
2008-09-30
Mack, Ricky (Department: 2873)
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Subjective type
C351S223000, C351S246000
Reexamination Certificate
active
07429109
ABSTRACT:
An optometric apparatus and an optometric method which perform an accurate eye examination on people who have a wide range of refractive powers with astigmatism, myopia or hyperopia, and which are also applicable especially to those with mixed astigmatism are provided. The apparatus performs a subjective eye examination by prompting a subject to view test symbols displayed on a computer screen by one of the right and left eyes at a time. The system includes astigmatic axis angle determination means which displays test symbols for determining an astigmatic axis angle and then determines the astigmatic axis angle, hyperopia and myopia determination means which displays test symbols for determining hyperopia or myopia in two orthogonal orientations selected based on the determined astigmatic axis angle, and determines hyperopia or myopia at the astigmatic axis angle and at an angle orthogonal thereto, and refractive power determination means which displays test symbols for determining a refractive power in two orthogonal orientations selected based on the determined astigmatic axis angle and determines a refractive power at the astigmatic axis angle and at an angle orthogonal thereto.
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Toshima Akio
Yoshida Takehiko
Keating & Bennett LLP
Mack Ricky
Tra Tuyen
Vision Optic Co., Ltd.
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