Retinal topography diffractive fundus lens

Details Retinal topography diffractive fundus lens Retinal topography diffractive fundus lens

2008-09-09

2008-09-09

Hasan, Mohammed (Department: 2873)

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

C351S205000

Reexamination Certificate

active

11618837

ABSTRACT:
Embodiments of the present invention provide a fundus lens. This fundus lens includes a first aspheric lens and a second aspheric lens and a diffractive optical element. This diffractive optical element is placed between the first and second aspheric lens and illuminated by an off access light source. The diffractive optical element contains a predetermined pattern which may be directed and imaged on a fundus. The first and second aspheric lenses are operable to gather light scattered by the fundus and provide the gathered light to a fundus camera. This fundus camera may then be operable to process the gathered light and determine the topography of the fundus.

REFERENCES:
patent: 4423931 (1984-01-01), Shapiro
patent: 4730910 (1988-03-01), Humphrey
patent: 4738521 (1988-04-01), Volk
patent: 4900144 (1990-02-01), Kobayashi
patent: 7048379 (2006-05-01), Miller et al.
patent: 2006/0170867 (2006-08-01), Koschmieder et al.

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