Hand held device and methods for examining a patient's retina

Details Hand held device and methods for examining a patient's retina Hand held device and methods for examining a patient's retina

2007-11-06

2007-11-06

Schwartz, Jordan (Department: 2873)

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

C351S215000

Reexamination Certificate

active

11053491

ABSTRACT:
A hand held device for examining a patient's retina. In one example, the device generates visible or non-visible illuminating beams having desired spectral content. The illuminating beams are then polarized to generate polarized light beam(s) that are directed towards the patient's retina. At the patient's eye, a portion of the polarized beam is partially reflected by the cornea and travels back to the device, and another portion of the polarized beam enters the eye through the undilated pupil, illuminates the patient's retina, and generates a reflected retinal image (generally de-polarized) which also travels back to the device. The device receives the retinal image and transmits certain portions of the retinal image on through to an image detector (i.e., CCD or CMOS); and the device deflects the received polarized corneal reflections away from the image capture device. Hence, the image capture device receives retinal images but does not receive the polarized corneal reflected light.

REFERENCES:
patent: 4208107 (1980-06-01), Oharek
patent: 4265518 (1981-05-01), Matsumura
patent: 4938584 (1990-07-01), Suematsu et al.
patent: 6112114 (2000-08-01), Dreher
patent: 2003/0156259 (2003-08-01), Shibutani et al.

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