Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1995-10-30
1997-12-02
Dang, Hung X.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351212, A61B 314, A61B 310
Patent
active
056941978
ABSTRACT:
A corneal shape measuring apparatus is provided which measures a corneal shape in such a way that a reflection image from a cornea (15) is recorded as image data and then the image data is analyzed. The apparatus includes LEDs (14) for projecting an index onto a subject's eye in order to detect a position of an apparatus body (3) in up, down, right, and left directions and in forward and backward directions with respect to the eye, an automatic photographic mode in which the eye is automatically photographed when a position of the apparatus body in up, down, right, and left directions with respect to the and a position of the apparatus body in forward and backward directions with respect to the eye are each within a predetermined range, a semi-automatic photographic mode in which the eye is photographed when a position of the apparatus body in up, down, right, and left directions with respect to the eye and a position of the apparatus body in forward and backward directions with respect to the eye are each within the predetermined range and, at the same time, a photography switch (11') is operated, and a manual photographic mode in which the eye is photographed when the photography switch is operated regardless of a position of the apparatus body with respect to the eye. A positional relationship of the apparatus body (3) to the eye is stored correspondingly to recorded image data.
Hatanaka Hideki
Kamiya Minoru
Kato Takeyuki
Sato Tsutomu
Tsukada Hisashi
Dang Hung X.
Kabushiki Kaisha Topcon
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