Nidek Co., Ltd.

Nobuharu Kobayashi

Naoki Isogai

Mitsuhiro Gono

Koki Kato

Noriyuki Ishihara

A corneal-shape measuring apparatus for measuring the shape of a cornea of an eye to be examined includes: a target plate formed of a transparent resin as its material and for projecting targets formed by light-transmitting portions and light-shielding portions onto a wide range of the cornea; a surface emitting plate for illuminating the targets from behind; an imaging optical system for picking up a target image formed on the cornea; a control unit and an image processing unit for analyzing the picked-up target image to determine the corneal shape; and an illuminating light source disposed to allow rays of light to be incident upon an end face of the target plate, wherein the target plate has the targets formed on its front surface facing the cornea, is provided with matte treatment of high reflectivity on a rear surface thereof, and is used jointly with the surface emitting plate.

Corneal-shaped measuring apparatus

An alignment detecting apparatus for detecting an alignment condition between an eye to be examined having approximately spherical surface or approximately toric surface and a device having a standard axial lines the apparatus comprising a target projecting optical system which includes a first target projecting optical system for projecting a first target with a predetermined angle relative to the standard axial line, and a second target projecting optical system for projecting a second target with a different angle compared with the angle of the first target projecting optical system relative to the standard axial lines of which at least one between the first and second targets is a target of a finite distances a detecting optical system for detecting positions of images of the first and second targets which are projected onto the eye by the first and second target projecting optical systems, and a judging device for judging the alignment condition based on results detected by the detecting optical system.

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Aichi, Japan

Nobuharu Kobayashi