Nidek Co., Ltd.

Katsuyasu Mizuno

Toshihiro Kobayashi

Tokio Ueno

Yuji Murase

Junichi Akita

Akihiro Fujishiro

Naoyuki Kondo

Yujiro Tochikubo

Nobuyuki Yano, Deceased

Yuichi Matsubara

An eyeglasses lens measurement device measures an eyeglasses lens of eyeglasses. The eyeglasses lens measurement device includes a light source that emits a measurement light flux toward the eyeglasses lens, a transmissive display that transmits the measurement light flux from the light source and displays an index pattern formed by arranging a plurality of indexes, a detector that detects the measurement light flux passing through the eyeglasses lens and the transmissive display, and a controller. The controller is configured to control a display of the index pattern, acquire an optical characteristic of the eyeglasses lens, based on a detection result of the detector, and acquire lens information different from the optical characteristic of the eyeglasses lens, based on a detection result of the detector.

Eyeglasses lens measurement device and non-transitory computer-readable storage medium

An ophthalmic apparatus includes: a light projecting optical system to project light to each point on a fundus of an examinee's eye; a light receiving optical system including a light receiving element to receive light from the fundus emitted from each point on the fundus resulting from the light projected from the light projecting optical system; and a controller for controlling the ophthalmic apparatus, wherein the controller is configured to: acquire intensity information representing intensity of the light from the fundus corresponding to each point on the fundus based on a result of received light of the light receiving element; and analyze a degree of opacity in an optic media of the examinee's eye based on the intensity information.

Ophthalmic apparatus, analysis program, optic media opacity acquiring method, and fluorescence intensity acquiring method

An ophthalmologic photographing apparatus includes: an illuminating optical system for irradiating an examinee's eye with illuminating light; an imaging optical system including an imaging device for receiving a reflected light flux from the eye, the imaging optical system having an imaging optical axis inclined with respect to an optical axis of the illuminating optical system; and a first optical member for reducing an imaging incidence angle, the imaging incidence angle being defined as an angle between a normal direction of an imaging surface of the imaging device and a principal ray of the reflected light flux.

Ophthalmologic photographing apparatus

An ophthalmic observation apparatus for observing an object region to be observed of an examinee's eye, comprises: an illumination optical system which has a laser source, a polygon mirror, and a galvano mirror, and which irradiates the object region with a laser beam emitted from the laser source by scanning the laser beam in two dimensions by use of the polygon mirror and the galvano mirror; a photo-receiving optical system which has a beam splitter placed on an optical path between the eye and the polygon mirror, and a photo-receiving element placed in a conjugate position with a pupil of the eye, the photo-receiving element being arranged to receive the laser beam reflected from the object region via the beam splitter, not via the polygon mirror; and an image processing part which processes an output signal from the photo-receiving element in sync with scanning operations of the polygon mirror and the galvano mirror to generate an observation image of the object region.

Ophthalmic observation apparatus

An apparatus for observing an eye of an examinee, comprises: an irradiation optical system for irradiating and two-dimensionally scanning a laser beam onto an observational objective part of the eye; an observation optical system having a photo-receiving element, for photo-receiving the laser beam reflected by the objective part to obtain an image of the objective part, the observation optical system sharing at least a part of the irradiation optical system; a display which displays the obtained image; a polarizing member arranged on an optical axis of the observation optical system, an arrangement angle of the polarizing member with respect to the optical axis being changeable to change a polarized component to be transmitted by the polarizing member.

A fundus imaging apparatus comprises: a beam emitter which simultaneously emits a first laser beam and a second laser beam having a different wavelength from the first beam; an irradiation optical system having a beam scanner which scans the emitted first and second beams in two dimensions on a fundus, the irradiation optical system being adapted to irradiate the emitted first and second beams onto the fundus; a first filter which intercepts the first and second beams reflected by the fundus and second fluorescence from the fundus by irradiation of the second beam and transmits first fluorescence from the fundus by irradiation of the first beam; a second filter which intercepts the first and second beams reflected by the fundus and the first fluorescence from the fundus and transmits the second fluorescence from the fundus; an imaging optical system having a photo-receiving element which receives the first fluorescence having passed through the first filter and the second fluorescence having passed through the second filter; a filter changer which continuously alternately disposes the first filter and the second filter in an optical path of the imaging optical system in sync with scanning by the beam scanner; and an image processing part which obtains a first fundus image based on a received light signal of the first fluorescence from the photo-receiving element and obtains a second fundus image based on a received light signal of the second fluorescence from the photo-receiving element.

Fundus imaging apparatus and fundus imaging method

A laser treatment apparatus comprises: an optical guiding body which guides a treatment laser beam omitted from a laser source; an irradiation optical system for irradiating the treatment beam guided by the optical guiding body; a first beam splitter placed in the irradiation optical system to split the treatment beam guided thereto; a photo-detector which detects output of one of the split treatment beams; and a depolarizer placed in an optical path between the optical guiding body and the first beam splitter to spatially disturb a polarization state of the guided treatment beam.

Laser treatment apparatus

An oblique incidence interferometer in which laser light from a laser light source is transmitted through a reference plane and is made incident upon a measurement surface from an oblique direction. The shape of the measurement surface is measured on the basis of interference fringes formed by reflected light reflected from the reference plane and reflected light reflected from the measurement surface. A deflecting element for deflecting the laser light emitted from the laser light source in order to decrease the coherence of the laser light is disposed in an optical path leading to the reference plane, the deflecting element being adapted to continuously change the direction of deflection.

Oblique incidence interferometer for removing higher-order interference fringes

A confocal scanning microscope comprises rotational disk having numerous pinholes arranged at positions that are conjugate with respect to an object to be observed, illumination optical system for implementing the pinhole-illumination for the object to be observed through the rotational disk, and observation optical system for conducting a reflected light beam from the illuminated object to be observed through the rotational disk and focuses the light beam to form an image for observation at a position that is conjugate with respect to the rotational disk, wherein the pinholes of the rotational disk are in equiangular arrangement on a parabolic spiral. The number of loops M of the parabolic spiral and the number of equiangular divisions in one round of the parabolic spiral at which the pinholes are located have any of relations: M:N=1:2, 3:2, 5:2, . . . , (2i-1):2, where i is an integer.

Confocal scanning microscope

A lens system disposed between the emitting area of a laser diode and a focal plane for focusing the output beam of the laser diode on the focal plane is disclosed, in which system, as regards a direction parallel to the lengthwise direction of the emitting area of the laser diode, the emitting area and the focal plane are conjugate, and a telescopic optical system is formed of the lens system to form a telescopic image indicative of the exit pupil of the lens system at an infinite distance and to make small the convergent angle of the laser beam incident on the focal plane.

Ophthalmic photocoagulating apparatus using a laser diode and a lens

An apparatus for performing an ophthalmic operation on an eye by photocoagulation using a laser beam while allowing continuous observation of the eye to be treated, includes a light source for producing the laser beam, an observing system having a first inherent optical path including a slit-lamp microscope, a laser optical system having a second inherent optical path, means for transmitting the laser beam from the light source to the laser optical system, means for introducing the laser beam from the second optical path of the laser optical system to the first optical path of the observing system, a contact lens having predetermined characteristics positioned in front of and contacting the eye to be treated, first optical means provided in the first inherent optical path of the observing system for adjusting an objective plane observable from the slit-lamp microscope, means for shifting the objective plane to a desired position along the optical path while observing the objective plane, and second optical means provided in the second inherent optical path of the laser optical system for adjusting a focal point, the laser beam being controlled while adjusting the focal point along the second optical path of the laser optical system, wherein the first optical means controls the movement of the objective plane observed from the observing system according to the predetermined characteristics of the contact lens and the second optical means adjusts the focal point to direct the laser beam on the objective plane.

Growing community of inventors

Gamagori, Japan

Katsuyasu Mizuno