Refractive power measurement apparatus

A refractive power measurement apparatus for measuring a refractive power of an eye to be measured, the apparatus comprising:

• a projection optical system which projects spot-shaped measurement light onto a fundus via a central portion of a pupil of the eye;
• a photo-receiving optical system provided with a photodetector which photo-receives the measurement light from the fundus and a lens system which guides the measurement light onto the photodetector;
• moving means for moving the lens system within a plane intersecting at right angles with an optical axis of the photo-receiving optical system so as to form a predetermined measurement pattern image on a photo-receiving surface of the photodetector;
• and
• calculation means for calculating the refractive power of the eye based on the measurement pattern image,
• wherein the lens system is arranged at a position conjugate with a position of the pupil, and the photodetector is arranged in the vicinity of a focal point of the lens system.

A refractive power measurement apparatus for measuring a refractive power of a lens to be measured, the apparatus comprising:

• a projection optical system which projects measurement light onto the lens;
• a photo-receiving optical system provided with a photodetector which photo-receives the measurement light passed through the lens and a lens system which guides the measurement light onto the photodetector;
• moving means for moving the lens system within a plane intersecting at right angles with an optical axis of the photo-receiving optical system so as to form a predetermined measurement pattern image on a photo-receiving surface of the photodetector;
• and
• calculation means for calculating the refractive power of the lens based on the measurement pattern image,
• wherein the lens system is arranged between the lens and the photodetector, and the photodetector is arranged in the vicinity of a focal point of the lens system.