Nidek Co., Ltd.

Kazuhiro Yoshimura

Akihiro Hayashi

Yasuhisa Murakami

Naoki Isogai

Toshiaki Mizuno

Yoshinobu Hosoi

Naoto Honda

Nobuyuki Yano

Yasumi Hikosaka

Toshiro Kobayashi

Shigekazu Takada

Yutaka Shirao

Kazuo Kawasaki

To provide an ophthalmic apparatus capable of performing efficient measurement of a plurality of eye characteristics of an examinee's eye, which comprises a first measurement unit comprising a first measurement system for performing measurement of a first characteristic of the eye, a second measurement unit comprising a second measurement system for performing measurement of a second characteristic of the eye, a measurement unit in which the measurement units are placed such that heights of first and second measurement axes of the respective systems are different from each other, a movement mechanism unit moving the measurement unit in a vertical direction, and a control unit controlling the mechanism unit such that the height of the first measurement axis at the time of first measurement by the first measurement unit becomes almost the same as that of the second measurement axis at the time of second measurement by the second measurement unit.

Ophthalmic apparatus

An ophthalmic apparatus capable of alignment in total automation and manual alignment with an examinee's eye comprising an ophthalmic examination unit, a unit detecting an alignment state of the examination unit with the eye, a main base, a mobile base on which the examination unit is mounted and moved horizontally on the main base through operation of a control member, driving mechanisms moving the examination unit vertically and horizontally with respect to the mobile base, means switching a mode between a manual mode of performing alignment of the examination unit with each eye in sequence through the operation and a fully automatic mode of performing the alignment through driving of the driving mechanisms, and a control unit controlling the driving based on the detection result which starts in the fully automatic mode the driving based on a predetermined trigger signal so as to perform the alignment.

An ophthalmic apparatus comprises: a base; an examination part which includes an optical system for examining an eye of a patient and is placed to be movable horizontally on the base; and a fixing mechanism provided in the examination part and arranged to fix the examination part on the base; wherein the fixing mechanism comprises: an arm pivotally mounted to be turned in an up and down directions; a fixing member which is supported by the arm so that it is brought in contact with the base by downward turning of the arm and it is separated from the base by upward turning of the arm, the fixing member having large friction with respect to the base; and an operating member for turning the arm in the up and down directions, the operating member having a longer distance from a turning center of the arm to a position of the operating member than a distance from the turning center of the arm to a position of the fixing member.

A slit-lamp biomicroscope which illuminates an eye to be examined with slit illumination light, the biomicroscope comprises an illumination optical system provided with an illumination light source and a slit plate of which slit width is adjustable, a plurality of types of filters each having a different optical characteristic which are inserted into, and removed from an optical path of the illumination optical system, a filter detection device for detecting a type of the filter being inserted in the optical path of the illumination optical system, a light amount change device for changing an amount of illumination light on a side of the illumination light source with respect to the slit plate and a control device for controlling the light amount change device such that the amount of illumination light is adjusted to an amount corresponding to the detected filter based on a detection result obtained by the filter detection device.

Slit-lamp biomicroscope

An apparatus for visual acuity test of an examinee's eye comprises test chart presenting device for changing and presenting test chart to the examinee's eye, a switch for designating test chart to be presented by the test chart presenting means, a light delivery optical system for delivering luminous flux of test chart from the test chart presenting means to the examinee's eye, the light delivery optical system comprising a concave mirror for making the luminous flux of test chart optically from 4 m ahead of the examinee to infinit and a first reflection mirror for reflecting the luminous flux reflected the concave mirror to the examinee's eye, and reflecting angle adjusting device for adjusting reflection angle of the reflection mirror so as to fit to a height of the examinee's eye, a housing for internally mounting the test chart presenting means and the light delivery optical system, the housing having an aperture to allow the luminous flux of test chart pass therethrough and the aperture being provided with a filter on which reflection reducing coating is coated.

Apparatus for visual acuity test having an adjustable mirror

An optometric apparatus includes an operating table and a vision test chart displaying device provided internally within the operating table. An optical group, including a plurality of reflection-type optical elements, are disposed within the operating table. The optical group repeatedly reflects an optical image of the vision test chart projected from the vision test chart displaying device along an optical path within said operating table. A first deflecting optical element reflects the optical image of the vision test chart reflected by the reflection-type optical element group outside the operating table in a first direction. A second deflecting optical element then reflects the optical image of the vision test chart reflected by the first deflecting optical element in a second direction toward the examinee's eyes. A line of vision of the examinee in looking at the optical image reflected by the second deflecting optical element obliquely intersects a plane passing through the optical path defined by the optical group.

Optometric apparatus

The inventive method and apparatus are based on the display of a striped target with constantly accurate contrast to the patient for finding a visual function disturbance associated with such eye diseases as glaucoma or diabetic repinopathy at their earlier stage. A sight target of striped pattern is formed on the screen having a uniform brightness, the striped target is oscillated in the direction orthogonal to the striped pattern while varying the contrast of striped target and showing it to the patient, and the threshold of the pattern contrast which can be recognized visually by the patient is measured.

Growing community of inventors

Toyohashi, Japan

Kazuhiro Yoshimura