Tokyo Kogaku Kikai Kabushiki Kaisha

Nidek Co., Ltd.

Kazuyuki Sasaki

Shinichi Nishimura

Hisakazu Yoshino

Nobuyuki Yano

A retroillumination image photographing apparatus of a crystalline lens in which an eye to be examined is projected by illumination light, and a crystalline lens is retroillumination with reflected light at an fundus of the illumination light, which includes: an alignment apparatus which aligns a photographing optical system of the retroillumination image photographing apparatus with a predetermined region of an eye to be examined; a storage apparatus which stores the position of the photographing optical system aligned by the alignment apparatus; and origin computing means which computes a specific region of the eye to be examined as an origin of an image pickup position of said photographing optical system based on the positional information of the storage apparatus; and detecting means which detects movement quantity of the image pickup position of the photographing optical system; and a display apparatus which displays the image pickup position of the photographing optical system based on the detection result of the detecting apparatus.

Apparatus for photographic retroillumination image on eyeground

An eye disease inspection instrument comprising a slit light projection optical system for projecting a slit light along a projecting optical axis to a patient's eye, a first optical system for observing a crystalline lens of the patient's eye at a section which is being illuminated by the slit light, a second optical system including an objective lens having an objective optical axis substantially coaxial with respect to the projecting optical axis for performing an observation under a retroillumination method.

Eye disease inspecting instrument

A slit lamp comprising a slit light projection optical system having a slit aperture for projecting a slit pattern light along a slit plane to a crystalline lens of a patient's eye and a microscope for observing a section of the crystalline lens which is illuminated by the slit pattern light. The microscope comprises an crystalline lens section recording optical system including a recording device having an image plane for recording the section of the crystalline lens of the patient's eye illuminated by the slit pattern light, and a retroillumination image recording optical system for guiding a retroillumination image of the crystalline lens to the recording device of the crystalline lens section recording optical system for recording the section of the crystalline lens. The crystalline lens section recording optical system including an imaging optical system having a principal plane which intersects an extension of the image plane of the recording device in an extension plan including the slit aperture and the projection optical axis of the slit light projection optical.

Growing community of inventors

Kanazawa, Japan

Kazuyuki Sasaki