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Fundus camera for wide field of view and small pupil
   
Document Number
US Patent 7360896
Issued Date
April 22, 2008
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Abstract
A fundus camera (10) obtains a retinal image using a light source (62), a ring aperture (58) conjugate to the cornea, and a first aperture (54) conjugate to the iris. An apertured mirror (52) redirects the ring illumination toward the eye. An objective lens (50) between the apertured mirror (52) and the eye has an entrance pupil between the iris and the cornea of the eye. The objective lens (50) directs the ring illumination into the pupil of the eye and directs a reflected image-bearing light from the retina through the apertured mirror (52). A second aperture (64), conjugate to a plane between the cornea and the iris of the eye, forms an aperture stop for the reflected image-bearing light. A third aperture (68) is conjugate to the cornea for blocking light reflected. A sensor (70) provides an image of the retina.
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Number of Claims:
5
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Owner
Carestream Health, Inc. (Rochester, NY)
Published
April 22, 2008
Application Number
11/247,100
Filed
October 11, 2005
US Classification
351/206   351/200
Int'l Classification
A61B   3/14   (20060101)   A61B   3/00   (20060101)  
Assistant Examiner
USPTO Field of Search
351/206  
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