Patent ID: 7490939
Filing Date: 2009-02-17
Classification: A61B

Abstract:
1. An eye-characteristics measurement apparatus comprising: a first light-source section for emitting a light beam having a first wavelength; a first illumination optical system for illuminating a minute area on the retina of an eye under measurement, with a light beam emitted from the first light-source section; a compensation optical section for compensating for aberration of a light beam transmitted or reflected, according to the amount of compensation given based on an optical characteristic of a reflected light beam which is reflected and returned from the retina of the eye under measurement; a first light-receiving optical system for receiving a part of the reflected light beam which is reflected and returned from the retina of the eye under measurement, through the compensation optical section and a first conversion member having a long focal length or a high sensitivity for converting to at least substantially 17 beams; a first light-receiving section for receiving a light beam received by the first light-receiving optical system; a third light-source section for illuminating the compensation optical section with a light beam having a third wavelength; a third light-receiving optical system for receiving a light beam emitted from the third light-source section, through the compensation optical section and a third conversion member for converting to at least substantially 17 beams; a third light-receiving section for receiving a light beam received by the third light-receiving optical system; a second light-receiving optical system for receiving a part of the reflected light beam which is reflected and returned from the retina of the eye under measurement, through the compensation optical section and a second conversion member having a short focal length, a low sensitivity, or a high density for converting to at least substantially 17 beams; a second light-receiving section for receiving a light beam received by the second light-receiving optical system; a compensation-amount calculation section for obtaining an optical characteristic of the eye under measurement based on the output of the second light-receiving section, for obtaining the amount of compensation based on the optical characteristic, and for outputting the amount of compensation to the compensation optical section; and a measurement calculation section for measuring an optical characteristic compensated by the compensation optical section based on the output of the third light-receiving section and an optical characteristic based on the output of the first light-receiving section, obtained after the compensation of the compensation optical section, and for obtaining an optical characteristic of the eye under measurement according to the measured optical characteristics.