Ocular fundus camera system and methodology
First Claim
1. An ocular fundus camera system comprising:
- light-source structure for illuminating the fundus in a subject'"'"'s eye,an optical path having upstream and downstream ends and an axis, extending downstream from the subject'"'"'s eye, and carrying, downstream along its length, both light that acts as if the pupil were its source, and light reflected from, and carrying an image of, the fundus,an image-detecting sensor located on the optical path proximate to the downstream end,an aperture operatively associated with, and stationary with respect to, said image-detecting sensor at a location which is upstream along the optical path from the image-detecting sensor,a discriminatory, light-content shifting structure disposed on said axis upstream therealong relative to said aperture, operable selectively for producing, within that portion of the optical path which is disposed intermediate the shifting structure and the aperture, relative trans-axial displacement-shifting solely of any non-collimated light carried in that portion of the optical path which is disposed immediately upstream from the shifting structure, anda structure selectively placeable across said illumination path for introducing, effectively, into light reflected from the fundus, edge-portion-containing optical contrast imagery having at least one contrast edge portion which lies at an angle relative to the direction of trans-axial shifting producible by said shifting structure, and whose spatial disposition in the fundus-reflection light is independent of eye movement.
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0 Petitions
Accused Products
Abstract
An ocular fundus camera system and an associated methodology. The system includes (a) an image sensor disposed along a fundus-image reflection path adjacent that path'"'"'s downstream end, and in optical communication with light carried in this path, (b) an aperture centered on the reflection path'"'"'s long axis, operatively associated with, and stationary with respect to, the sensor at a location which is upstream from the sensor, and (c), for accomplishing (1) precision fundus-image focusing on the sensor, and additionally (2) autorefraction, optical, light-content shifting structure, operable selectively for producing, within that portion of the reflection path which is disposed downstream from the shifting structure, relative trans-axial displacement solely of any non-collimated light carried in that portion of the main path which is disposed upstream from the shifting structure.
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Citations
15 Claims
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1. An ocular fundus camera system comprising:
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light-source structure for illuminating the fundus in a subject'"'"'s eye, an optical path having upstream and downstream ends and an axis, extending downstream from the subject'"'"'s eye, and carrying, downstream along its length, both light that acts as if the pupil were its source, and light reflected from, and carrying an image of, the fundus, an image-detecting sensor located on the optical path proximate to the downstream end, an aperture operatively associated with, and stationary with respect to, said image-detecting sensor at a location which is upstream along the optical path from the image-detecting sensor, a discriminatory, light-content shifting structure disposed on said axis upstream therealong relative to said aperture, operable selectively for producing, within that portion of the optical path which is disposed intermediate the shifting structure and the aperture, relative trans-axial displacement-shifting solely of any non-collimated light carried in that portion of the optical path which is disposed immediately upstream from the shifting structure, and a structure selectively placeable across said illumination path for introducing, effectively, into light reflected from the fundus, edge-portion-containing optical contrast imagery having at least one contrast edge portion which lies at an angle relative to the direction of trans-axial shifting producible by said shifting structure, and whose spatial disposition in the fundus-reflection light is independent of eye movement. - View Dependent Claims (2, 3)
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4. An ocular fundus camera system usable in relation to a light-illuminated fundus in a subject'"'"'s eye, comprising:
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an image-detecting sensor disposed centrally along an optical path adjacent a downstream end, and in optical communication with light carried in said optical path, an aperture centered on the optical path'"'"'s long axis, operatively associated with, and stationary with respect to, said sensor at a location which is upstream from the sensor, and an optical, light-content shifting structure, operable selectively for producing, within that portion of the optical path which is disposed downstream from the shifting structure, relative trans-axial displacement solely of any non-collimated light carried in that portion of the optical path which is disposed upstream from the shifting structure. - View Dependent Claims (5, 6, 7, 8, 9, 10)
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11. A method comprising:
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illuminating a fundus in a subject'"'"'s eye along an elongate illumination path, creating a light reflection from the fundus directed therefrom outwardly through the pupil in a flow of reflection light which progresses downstream from the eye along an elongate optical path having an axis, discriminatorily, and in a relative trans-axial displacement manner at a location along the optical path which is disposed downstream from the eye, shifting solely any non-collimated light which is contained in the flow of created reflection light, detecting said shifting, and employing any detected shifting in a manner designed to minimize the presence of non-collimated light in the reflection-light flow. - View Dependent Claims (12, 13, 14, 15)
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Specification