Kabushiki Kaisha Topcon

Tokyo Kogaku Kikai Kabushiki Kaisha

Minoru Kamiya

Takeyuki Kato

Tsutomu Sato

Hisashi Tsukada

Shinji Wada

Ikuo Kitao

Kiwami Horiguchi

Akio Sakurai

Masayuki Masuyama

Hideki Hatanaka

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.

Corneal shape measuring apparatus

A corneal shape measuring apparatus includes a system 1 for concentrically projecting a plurality of ring images 6 onto a cornea C, a system 3 for receiving the ring images 6 projected onto the cornea C, and a multipoint detecting circuit 9 and a light emission controlling circuit 10 each for avoiding the overlap of adjacent ring images of the ring images 6 projected onto the cornea C.

An eye refractometer comprising a measuring target projection optical system for projecting a measuring target image to the eye fundus of a patient's eye by means of a pair of beams of light from a measuring target; a rotating device for rotating the pair of beams of light around the optical axis; a measuring target image-forming optical system for forming a target image of the beams of light projected through the measuring target image projected to the eye fundus; a detection device for two-dimensionally detecting the position of the target image formed by the image-forming optical system on a plane perpendicular to the optical axis; and an operating circuit for obtaining a refractive power of the eye along a radial line passing through the centers of the pair of beams of light by means of the signal from the detection device.

Eye refractometer

Growing community of inventors

Tokyo, Japan

Minoru Kamiya