Device for measuring optical characteristic of eye

Details Device for measuring optical characteristic of eye Device for measuring optical characteristic of eye

2007-05-22

2007-05-22

Dang, Hung Xuan (Department: 2873)

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

C351S200000

Reexamination Certificate

active

10494722

ABSTRACT:
The position of an object surface is detected with an error reduced on a reflectance boundary surface. A first light source (100) emits the luminous flux of the first wavelength. A first illumination optical system (200A) illuminates a small area on a retina (61) to be examined by the first luminous flux from the first light source (100). A first reception optical system (300A) guides a part of the luminous flux which is reflected by and returning from the retina (61) to be examined to a first light reception part (510) via a first conversion member (400) for converting the reflected luminous flux into at least 17 beams. A second light source (110) emits the luminous flux of the second wavelength. A second illumination optical system (200B) illuminates a predetermined area on the retina (61) to be examined by the second luminous flux from the second light source (110). A second reception optical system (300B) guides the second luminous flux reflected by and returning from the retina (61) to a second light reception part (520). A display part checks at which position on the fundus oculi (61) of the eye (60) the luminous flux for measurement is converged or fixed, and the position of convergence and the position of measurement are changed by using a drive unit to move a fixation mark or the irradiation position of the irradiation light for Hartmann measurement.

REFERENCES:
patent: 6525883 (2003-02-01), Hirohara et al.
patent: 10-216092 (1998-08-01), None
patent: 10-305013 (1998-11-01), None
patent: 11-137522 (1999-05-01), None
patent: 2001-204690 (2001-07-01), None

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