Nidek Co., Ltd.

Mitsuhiro Gono

Masaaki Hanebuchi

Naoki Isogai

Kenji Nakamura

Koji Hamaguchi

Mikio Kurachi

Hisashi Ochi

Koki Kato

Nobuharu Kobayashi

Noriyuki Ishihara

An eye measurement apparatus includes: a subjective measurement optical system configured to subjectively measure an examinee's eye, the subjective measurement optical system including: a chart to be presented to the examinee's eye; and a glare light source for irradiating the examinee's eye with a glare light; and a control part configured to determine presence or absence of opacity in a light transmitting part of the examinee's eye and, when the presence of opacity is determined, to allow display of necessity for a glare test which is a subjective measurement to be performed in a state that the examinee's eye is irradiated with the glare light.

Eye measurement apparatus

An eye refractive power measurement apparatus includes: a measuring optical system for projecting measurement light onto a fundus of an examinee's eye, and causing a two-dimensional imaging device to capture the measurement light to be reflected from the fundus as a plurality of target pattern images at different distances from a measurement optical axis; a light deflecting member arranged at a position out of a conjugate position with a pupil of the examinee's eye on an optical path of the measuring optical system; a rotor for rotating the light deflecting member about an optical axis of the measuring optical system to allow a plurality of pattern light beams to be eccentrically rotated on the pupil; and a calculator for measuring an eye refractive power of the examinee's eye based on a target pattern image to be captured by the two-dimensional imaging device.

Eye refractive power measurement apparatus

An eye refractive power measurement apparatus measures both eye refractive powers in cases where a pupil is small and large in diameter with ease. This apparatus includes: a measuring optical system causing an imaging device to capture a ring-shaped image based on measurement light reflected from a fundus of an examinee's eye; a light deflecting member arranged at a position, which is not conjugated with a pupil of the examinee's eye, on an optical path of the measuring optical system; a rotor causing the light deflecting member to rotate about an optical axis of the measuring optical system; and an eccentricity amount changer changing an amount of eccentricity of the measurement light, which is rotated eccentrically on a surface of the pupil, with respect to a center of the pupil, in order to change a region, where the measurement light passes, on the surface of the pupil.

An eye refractive power measurement apparatus for objectively measuring eye refractive power of a patient's eye, includes: a light-projecting optical system that includes a light source and projects measurement light onto a fundus of the patient's eye; a light-receiving optical system that includes an imager device serving as a two-dimensional light-receiving element and receives the measurement light reflected from the fundus; and an operating section that determines the eye refractive power of the eye based on a two-dimensional pattern image by the measurement light imaged by the imager device. The light source is a super-luminescent diode or a laser diode that emits light having a center wavelength in a range of approximately 850 nm to 940 nm.

An eye refractive power measurement apparatus capable of measuring even an eye with a small pupil diameter with accuracy and stability. The apparatus has a measurement optical system including a projection optical system, having a light source, for projecting spot-shaped measurement light onto a fundus and a photo-receiving optical system, having a photodetector, for photo-receiving the measurement light reflected from the fundus via a peripheral pupillary portion, a calculation part which obtains the eye reflective power based on an output from the photodetector, alight deflection member, an arrangement of which in the measurement optical system being prevented from having a positional relationship optically approximately conjugate with a pupil, and a rotation unit which rotates the light deflection member about a measurement optical axis of the measurement optical system.

An eye refractive power measurement apparatus which is capable of measuring even an eye with a small pupil diameter and measuring a normal eye with a large enough pupil diameter with accuracy and stability. The apparatus includes a measurement optical system for photo-receiving measurement light from a fundus via a ring-shaped aperture arranged at an approximately conjugate position with a pupil by using a photodetector, a changing device for changing a size of the ring-shaped aperture on a pupillary surface to a size different in both inside diameter and outside diameter, and a calculation device for calculating the eye refractive power based on a photo-receiving result obtained by the photodetector.

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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Toyokawa, Japan

Mitsuhiro Gono