US 6,629,761 B1 · Eye characteristic measuring apparatus · patentgrep

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Abstract

The present invention provides an eye characteristic measuring apparatus provided with an image forming condition changing unit for achieving an appropriate illuminating condition and capable of setting an optimum illuminating condition and an optimum light receiving condition. A first light source emits light, a first illuminating optical system illuminates a small region of the retina of the eye with the light emitted by the first illuminating optical system in a variable illuminating condition, a first photodetecting optical system guides part of reflected light reflected from the retina of the eye through a first transforming device that divides the reflected light into at least seventeen light beams to a first photodetecting device, an arithmetic unit determines the optical characteristic of the eye on the basis of a first signal provided by the first photodetecting device and corresponding to the inclination of light, and an image forming condition changing unit changes the respectively image forming conditions of the first illuminating optical system and the first photodetecting optical system.

Claims19

Dependent claims

An eye characteristic measuring apparatus comprising:

a first light source that emits light of a first wavelength;
a first illuminating optical system capable of illuminating a small region of the retina of an eye in a variable illuminating condition with the light emitted by the first light source;
a first photodetecting optical system provided with a first transforming device that divides reflected light reflected from the retina of the eye into a least seventeen light beams and a first photodetecting device that receives part of the reflected light reflected from the retina through the first transforming device;
an arithmetic unit that determines optical characteristics of the eye on the basis of a first signal provided by the first photodetecting device and corresponding to inclination of the transforming light from transform device;
and
an image forming condition changing unit that changes respective image forming conditions of the first illuminating optical system and the first photodecting optical system according to the first signal provided by the first photodetecting device to set a first changed state and changes respective image forming conditions of the first illuminating optical system and the first photodetecting optical system according to optical characteristics determined by the arithmetic unit to set a second changed state.

3 more elements

An eye characteristic measuring apparatus comprising:

a first light source that emits light of a first wavelength;
a first illuminating optical system capable of illuminating a small region of the retina of an eye in a variable illuminating condition with the light emitted by the first light source;
a first photodetecting optical system provided with a first transforming device that divides reflected light reflecting from the retina of the eye into at least seventeen light beams and a first photodetecting device that receives part of reflected light reflected from the retina through the first transforming device;
a second photodetecting optical system provided with a second photodetecting device that receives second light reflected from the retina of the eye;
an arithmetic unit that determines optical characteristics of the eye n the basis of a first signal provided by the first photodetecting device and corresponding to inclination of the transforming light from transform device;
and
an image forming condition changing unit that changes respective image forming conditions of the first illuminating optical system and the first photodetecting optical system according to a least a second signal provided by the second photodetecting device.

4 more elements

An eye characteristic measuring apparatus comprising;

a first light source that emits light of a first wavelength;
a first illuminating optical system capable of illuminating a small region of the retina of an eye in a variable illuminating condition with the light emitted by the first light source;
a first photodetecting optical system provided with a first transforming device that divides reflected light reflected from the retina of the eye into a least seventeen light beams and a first photodetecting device that receives part of the reflected light reflected from the retina through the first transforming device;
a second light source that emits light of a second wavelength;
a second illuminating optical system capable of illuminating a predetermined region of the retina of the eye in a variable illuminating condition with the light of the second wavelength emitted by the second light source;
a second photodetecting optical system provided with a second photodetecting device that receives reflected light of the second wavelength reflected from the retina;
an arithmetic unit that determines optical characteristics of the eye on the basis of a first signal provided by the first photodecting device and corresponding to inclination of the transforming light from transform device and detects illuminating conditions of the first illuminating optical system on the basis of a second signal provided by second photodecting device;
and
an image forming condition changing unit that changes respective image forming conditions of the first illuminating optical system and the first photodetecting optical system according to a level of a first signal provided by the first photodetecting device to set a first change state, and changes respective image forming conditions of the first illuminating optical system and the first photodetecting optical system according to the optical characteristics determined by the arithmetic unit to a second changed state.

6 more elements

An eye characteristic measuring apparatus comprising:

a first light source that emits light of a first wavelength;
a first illuminating optical system capable of illuminating a small region of the retina of an eye in a variable illuminating condition with the light emitted by the first light source;
a first photodetecting optical system provided with a first transforming device that divides first reflected light reflected from the retina of the eye into at least seventeen light beams with first aperture and a first photodetecting device that receives the reflected light reflected from the retina through the first transforming device;
a second photodetecting optical system provided with a second transforming device that divides second reflected light reflected from the retina of the eye into at least four light beams with second aperture greater than those of first transforming device and a second photodetecting device that receives the second reflected light reflected from the retina through the second transforming device;
an arithmetic unit that determines optical characteristics of the eye on the basis of a second signal provided by the second photodetecting device;
and
an image forming condition changing unit that changes respective image forming conditions of the first illuminating optical system and the first photodetecting optical system according to the optical characteristics determined by the arithmetic unit.

4 more elements

An eye characteristic measuring apparatus comprising:

a first light source that emits light of a first wavelength;
a first illuminating optical system capable of illuminating a small region of the retina of an eye in a variable illuminating condition with the light emitted by the first light source;
a first photodetecting optical system provided with a first transforming device that dives first reflected light reflected from the retina of the eye into at least seventeen light beams with first aperture and a first photodetecting device that receives the reflected light reflected from the retina through the first transforming device;
a second photodetecting optical system provided with a second transforming device that divides second reflected light reflected from the retina of the eye into at least four light beams with second aperture greater than those of the first transforming device and a second photodetecting device that receives the second reflected light through the second transforming device;
an arithmetic unit that determines optical characteristics of the eye on the basis of a first signal provided by the first photodetecting device and corresponding to an inclination of the transforming light from transform device and determines illuminating conditions of the first illuminating optical system;
and
an image forming condition changing unit that changes respective image forming conditions of the first illuminating optical system and the first photodetecting optical system according to a level of a second signal provided by the second photodetecting device to set a first changed state, and then changes image forming conditions of the first illuminating optical system and the first photodetecting optical system according to the optical characteristics determined by the arithmetic unit to set a second changed state.

4 more elements

An eye characteristic measuring apparatus comprising:

a first light source that emits light of a first wavelength;
a first illuminating optical system capable of illuminating a small region of the retina of an eye in a variable illuminating condition with the light emitted by the first light source;
a first photodetecting optical system for setting a first state where reflected light reflected from the retina of the eye is guided through a first transforming device that divides the reflected light into at least seventeen light beams to a first photodetecting device and a second state where the reflected light is guided through a second transforming device that divides the reflected light into a number of light beams less than that of the light beam provided by the first transforming device to a second photodetecting device;
an image forming condition changing unit that changes respective image forming conditions of the first illuminating optical system and the first photodetecting optical system on the basis of a second signal provided by the first photodetecting device in the second state;
and
an arithmetic unit that determines optical characteristics of the eye on the basis of a first signal provided by the first photodetecting device in the first state.

3 more elements

An eye characteristic measuring apparatus comprising:

a first light source that emits light of a first wavelength;
a first illuminating optical system capable of illuminating a small region of the retina of an eye in a variable illuminating condition with the light emitted by the first light source;
a first photodetecting optical system capable of setting a first state in which reflected light reflected from the retinal of the eye is divided into at least seventeen light beams and a second state in which the reflected light is divided into a number of light beams smaller than that of light beams formed in the first state;
an image forming condition changing unit that changes respective image forming conditions of the first illuminating optical system and the first photodetecting optical system on the basis of a second signal provided by the first photodetecting device in the second state;
and
an arithmetic unit that determines optical characteristics of the eye on the basis of a first signal provided by the first photodetecting device in the first state.

3 more elements

Dependencies are inferred from the claim text.