Apparatus and Method for the Reduction of Purkinje Reflections and Haze Associated With a Contact-type Wide Angle Real-Time Video Output Fundus Imaging System
AssigneeNatus Acquisition II, LLC
InventorsYan Zhou, Willem Crone, John Allison
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Abstract
A contact-type eye imaging apparatus including a light source, a light transmission structure optically coupled to the light source and positioned to emit light in a direction of a patient eye defining an illumination path, one or more optical lenses defining an imaging path, and a first polarizer positioned in the imaging path. Light emitted by the light transmission structure may be subsequently polarized, defining polarized illumination light. The first polarizer may be configured to at least partially cross-filter specularly reflected polarized illumination light from the patient eye.
Claims17
A contact-type eye imaging apparatus comprising:
- a light source;
- a light transmission structure optically coupled to the light source and positioned to emit light in a direction of a patient eye defining an illumination path;
- one or more optical lenses defining an imaging path;
- a first polarizer positioned in the imaging path;
- and
- a second polarizer positioned in the illumination path to create polarized illumination light, being configured as an annular ring, and positioned such that the imaging path passes through an aperture defined by the second polarizer;
- wherein the first polarizer is configured to at least partially cross-filter specularly reflected polarized illumination light from the patient eye.
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Dependencies are inferred from the claim text.