Macula-disc camera with improved resolution
AssigneeThe United States of America as represented by the Department of Health and Human Services
InventorOleg Pomerantzeff
Life of this patent
Estimating the term…
Abstract
A macula-disc camera records the first aerial image of the patient's fundus to provide an actual increase in resolution of retinal detail not obtainable by merely magnifying this image with the recording optics. An array of optical fibers surrounds the contact lens to illuminate a limied field of the fundus, on the order of 18.degree.. A high degree of contrast is achieved by tightly separating the observation and illumination beams throughout the lens of the cornea and crystalline lens. Magnification, is on the order of 6.8 times.
Claims13
Optical image forming apparatus for use with a fundus camera having an optical axis, said apparatus comprising:
- an inner hollow generally conical member having a forward end;
- an outer hollow generally conical member having a forward end and disposed concentrically about and spaced from said inner member;
- a contact lens disposed radially interiorly of said inner member, at the forward end of said inner member, through which the interior of an eye can be photographed;
- and
- an array of optical fibers disposed in the space between said inner and outer members, surrounding said contact lens, for illuminating a field of approximately 18.degree. of the fundus of the eye to be photographed;
- wherein said contact lens is positioned to provide an optical image of the illuminated portion of said fundus.
Optical image forming apparatus for use with a fundus camera having an optical axis, said apparatus comprising:
- an inner hollow generally conical member having a forward end;
- an outer hollow generally conical member having a forward end and disposed concentrically about and spaced from said inner member;
- a contact lens disposed interiorly of said inner member, at the forward end of said inner member, through which the interior of an eye can be photographed;
- an array of optical filters disposed in a space between said inner and outer members surrounding said contact lens for illuminating a relatively small field of the fundus of the eye to be photographed;
- and
- means for tightly separating, throughout the lens of the cornea and crystalline lens of the eye being photographed, the illuminating beam emanating from said optical fibers and the reflected image of the illuminated portion of the fundus.
Dependencies are inferred from the claim text.