Ophthalmic photographing apparatus

Details Ophthalmic photographing apparatus Ophthalmic photographing apparatus

2009-06-02

2010-11-02

Mack, Ricky L (Department: 2873)

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

C351S210000

Reexamination Certificate

active

07824035

ABSTRACT:
An ophthalmic photographing apparatus comprising a photographing optical system for obtaining a regional image of an examinee's eye, comprising a light source, a focusing optical element movable in an optical-axis direction by a driving mechanism, and a photodetector, and a control unit controlling driving of the mechanism and obtain the image based on a signal from the photodetector, wherein the control unit further moves the optical element in predetermined steps/continuously to obtain the image at each position, calculates frequency distribution of luminance of each of the images to detect a change characteristic of luminance values having frequencies equal or exceeding a threshold value in the frequency distribution with respect to the optical element position, and detects a focus position of the optical element based on the change characteristics to move the optical element to a position corresponding to the detected focus position.

REFERENCES:
patent: 4899194 (1990-02-01), Hori
patent: 7510282 (2009-03-01), Ueno et al.
patent: 1 882 445 (2008-01-01), None
patent: A-2005-279121 (2005-10-01), None
patent: A-2006-212153 (2006-08-01), None
patent: A-2008-29467 (2008-02-01), None

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