Patent ID: 9232889
Filing Date: 2016-01-12
CPC Classification: A61B,G06T

Claim Text:
1. An ocular surface examination apparatus, comprising: a light source for directing light along an illumination path onto an ocular surface; an illumination filter that filters light in the illumination path prior to the light contacting the ocular surface, the illumination filter being structured to remain along the illumination path; an imaging filter that filters light reflected from the ocular surface and transmits light from a contrast agent on the ocular surface of a patient along an imaging path, the imaging filter being structured to remain along the imaging path; an image capture device for detecting light from the contrast agent on the ocular surface of the patient; an optical system to increase depth of field by collecting several images from the image capture device at different focal planes and rendering the images into a single in-focus image; wherein the illumination filter and the imaging filter are band-pass filters that transmit light in non-overlapping bands; and a machine readable storage medium comprising a set of instructions that when executed by a processor, are configured to: wherein an optical density of the illumination filter at wavelengths other than 465 to 500 nm is at least 5.0 and an optical density of the imaging filter at wavelengths less than 515 nm is at least 5.0.