US 7,677,731 B2 · Eye optical characteristic measuring apparatus

Abstract

Scattering can be measured by using an optical system having a Hartman-Shack wave-surface sensor. An eye optical characteristic measuring instrument comprises a light source unit 10 for emitting a light beam of a wavelength in the near-infrared region, an illumination optical system 40 for illuminating a small area of the retinal of an eye to be measured with the light beam from the light source unit 10, a light-receiving optical system 20 for receiving a part of the reflected beam of the light beam from the light source unit 10 reflected from the retina through a converting member for converting the part of the reflected light beam into at least substantially 17 light beams, a light-receiving section 23 for receiving the received light beam directed by the light-receiving optical system 20 and generating a signal, and a calculating unit for determining the wavefront aberration of the light beam entering the light-receiving optical system 20 and the degree of scattering of the received light beam on the basis of the signal from the light-receiving section 23.

Claims17

Dependent claims

An eye optical characteristic measuring apparatus, comprising:

a light source part for emitting a light flux of a specified wavelength;
an illumination optical system for illuminating a minute area on a retina of a subject eye with the light flux from the light source part;
a light receiving optical system for receiving a part of a reflected light flux which is the light flux emitted from the light source part and reflected by the retina of the subject eye, through a conversion member for converting it into at least substantially 17 beams;
a light receiving part for receiving a received light flux guided by the light receiving optical system to form signals;
and
an arithmetic part for obtaining wavefront aberrations of the light flux incident on the light receiving optical system and a scattering degree of the received light flux on the basis of the signals from the light receiving part,
wherein the illumination optical system has a wedge-shaped rotary prism to uniform irregular characteristics of the reflected light flux from the retina,
the wedge-shaped rotary prism is disposed at a substantially conjugated position with respect to a pupil of the subject eye,
by a rotation of the wedge-shaped rotary prism, the reflected light flux from the retina becomes uniform and the light receiving part receives scattering degree component of the reflected light flux appropriately.

6 more elements

An eye optical characteristic measuring apparatus, comprising:

a light source part for emitting a light flux of a specified wavelength;
an illumination optical system for illuminating a minute area on a retina of a subject eye with the light flux from the light source part;
a light receiving optical system for receiving a part of a reflected light flux which is the light flux emitted from the light source part and reflected by the retina of the subject eye, through a conversion member for converting it into at least substantially 17 beams;
a light receiving part for receiving a received light flux guided by the light receiving optical system to form signals;
and
an arithmetic part for obtaining wavefront aberrations of the light flux incident on the light receiving optical system and a spot diameter of the received light flux on the basis of the signals from the light receiving part,
wherein the illumination optical system has a wedge-shaped rotary prism to uniform irregular characteristics of the reflected light flux from the retina,
the wedge-shaped rotary prism is disposed at a substantially conjugated position with respect to a pupil of the subject eve,
by a rotation of the wedge-shaped rotary prism, the reflected light flux from the retina becomes uniform and the light receiving part receives scattering degree component of the reflected light flux appropriately.

6 more elements

An eye optical characteristic measuring apparatus, comprising:

a light source part for emitting a light flux of a specified wavelength;
an illumination optical system for illuminating a minute area on a retina of a subject eye with the light flux from the light source part;
a light receiving optical system for receiving a part of a reflected light flux which is the light flux emitted from the light source part and reflected by the retina of the subject eye, through a conversion member for converting it into at least substantially 17 beams;
a light receiving part for receiving a received light flux guided by the light receiving optical system to form signals;
and
an arithmetic part for obtaining a point spread function obtained from wavefront aberrations of the light flux incident on the light receiving optical system and an actually measured spot diameter of the received light flux on the basis of the signals from the light receiving part,
wherein the illumination optical system has a wedge-shaped rotary prism to uniform irregular characteristics of the reflected light flux from the retina,
the wedge-shaped rotary prism is disposed at a substantially conjugated position with respect to a pupil of the subject eye.
by a rotation of the wedge-shaped rotary prism, the reflected light flux from the retina becomes uniform and the light receiving part receives scattering degree component of the reflected light flux appropriately.

6 more elements

Dependencies are inferred from the claim text.

Eye optical characteristic measuring apparatus

Life of this patent

Eye optical characteristic measuring apparatus

Life of this patent

Abstract

Claims17