US 2014/0211165 A1 · SUBJECTIVE EYE REFRACTING POWER MEASUREMENT APPARATUS

Abstract

There is provided a subjective eye refracting power measurement apparatus which measures a refracting power of a subject eye. The apparatus includes a projection optical system which projects a visual target light flux toward the subject eye to form a visual target on a fundus of the subject eye; a correction optical system which changes a refracting power thereof; a relay optical system which relays a light flux passing through the correction optical system and to form an image of the correction optical system in front of the subject eye; a deviation detector which detects a positional deviation of the image of the correction optical system with respect to the subject eye; and a correction unit which optically corrects a formation position of the image based on a detection result by the deviation detector such that the image is formed in front of the subject eye.

Claims15

Dependent claims

A subjective eye refracting power measurement apparatus configured to measure a refracting power of a subject eye, the apparatus comprising:

a projection optical system configured to project a visual target light flux toward the subject eye to form an eye-examination visual target on a fundus of the subject eye;
a correction optical system disposed in an optical path of the projection optical system and configured to change a refracting power thereof;
a relay optical system configured to relay a light flux passing through the correction optical system and to form an image of the correction optical system in front of the subject eye;
a deviation detector configured to detect a positional deviation of the image of the correction optical system with respect to the subject eye;
and
a correction unit configured to optically correct a formation position of the image of the correction optical system based on a detection result by the deviation detector such that the image of the correction optical system is formed in front of the subject eye.

3 more elements

A subjective eye refracting power measurement apparatus configured to measure a refracting power of a subject eye, the apparatus comprising:

a projection optical system configured to project a visual target light flux toward the subject eye to form an eye-examination visual target on a fundus of the subject eye;
a correction optical system disposed in an optical path of the projection optical system and configured to change a refracting power thereof;
a relay optical system configured to relay a light flux passing through the correction optical system and to form an image of the correction optical system in front of the subject eye;
a distance change unit configured to optically change a presentation distance of the visual target between for a far distance examination and for a near distance examination;
and
an optical path switch unit configured to switch between a first optical path for projecting the visual target light flux toward the subject eye from a horizontal direction and a second optical path for projecting the visual target light flux toward the subject eye from a direction which is tilted downward with respect to the horizontal direction.

3 more elements

Dependencies are inferred from the claim text.

Subjective eye refracting power measurement apparatus

Life of this patent

Subjective eye refracting power measurement apparatus

Life of this patent

Abstract

Claims15