Nidek Co., Ltd.

Nobuyuki Yano

Naoki Isogai

Masanao Fujieda

Yoshinobu Hosoi

Akihiro Hayashi

Tokio Ueno

Yasuo Ota

Yoshiaki Mimura

Kazuhiro Yoshimura

Kazuyuki Sasaki

Yasutaka Sukigara

Toshiro Kobayashi

Tsuguo Nanjho

A slit lamp microscope, which includes an illumination optical system for slit illumination onto an eye to be examined and an observing optical system containing an objective lens for observation of the eye exposed to the slit illumination, comprises a confocal scanning microscope unit containing an illumination optical system for illuminating a rotating circular disc provided with a plurality of pinholes and illuminating an observation plane of the eye to be examined by illumination light transmitted through the pinholes of the rotating circular disc, and a light delivery optical system for focusing the luminous flux reflected from the observation plane of the eye on the rotating circular disc and delivering it to the objective lens, and a setting device to set the confocal scanning microscope unit in the front of the objective lens.

Slit lamp microscope provided with a confocal scanning mechanism

An ophthalmic apparatus in which alignment light is projected on the objected eye, and cornea reflecting images of the alignment light are detected at a first and a second detecting optical systems disposed in different directions respectively and, based on the detected data at the first and the second detecting optical systems, a three-dimensional position of the measured portion is found out by a calculating device.

Ophthalmic apparatus having three dimensional calculating means

An ophthalmometric apparatus, such as an apparatus for measuring the opacity of the lens of the examinee's eye, comprises an alignment light projecting optical system for projecting alignment light rays on the examinee's eye, a position detecting optical system for detecting the position of a bright spot of corneal reflection formed by the alignment light projecting optical system, a position calculating means for calculating position data representing the position of the examinee's eye relative to a reference position on the basis of detection data provided by the position detecting optical system, an observation optical system for observing the front of the examinee's eye, provided with a filter means for intercepting at least part of the alignment light rays, and a display means for displaying the front of the examinee's eye, the bright spot of the corneal reflection, an image of a reference mark, and position data representing the position of the examinee's eye in an XYZ coordinate system on the observation optical system.

Ophthalmometric apparatus with alignment device including filter means

An ophthalmic apparatus for use by an examiner in examining an examinee's eye includes an optical system for examining the examinee's eye, an observing optical path for observing the examinee's eye directly in binocular vision, a beam splitter disposed in the observing optical path, and a mark forming device for forming an aiming mark at a position conjugate to a predetermined portion of the anterior part of the eye, the light of the aiming mark being reflected by the light splitting member into the eyes of the examiner, wherein the positional relationship along the observing optical path between the anterior part of the examinee's eye and the aiming mark is perceived through the examiner's eyes and the suitability of the working distance of the apparatus can be judged.

Ophthalmic apparatus with positioning control

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

A stereoscopic retinal camera comprises an illuminating optical system, a photographing optical system, an observation optical system and a focus detection optical system. The focusing optical system consists of an index projecting system combined with one of the two light paths of the observation optical system, and an index detecting system combined with the other light path of the observation optical system. The respective positions of the focusing lenses of the photographing optical system are adjusted so that a sharp image of the focusing index is detected by the index detecting system. Thus, the stereoscopic retinal camera can be easily focused without requiring any particular skill and is capable of enabling the minute observation of the fundus of the eye by means of a direct-vision viewfinder.

Stereoscopic retinal camera

This application discloses a laser apparatus including a binocular indirect ophthalmoscope for irradiating a treatment laser beam on an eye to be treated comprising, an optical fiber for guiding the treatment laser beam to the binocular indirect ophthalmoscope, an optical element, which reflects the treatment laser beam while penetrates a pair of observation beams of the binocular indirect ophthalmoscope is provided in the object side of an ophthalmoscope lens, an optical system which directs the treatment laser beam to said optical element so that the axis of the treatment laser beam coincides with the substantial center of said pair of observation beam axes, whereby the power of the treatment laser beam becomes stable owing to above constitution.

Laser apparatus including binocular indirect ophthalmoscope

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.

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Okazaki, Japan

Nobuyuki Yano