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Patent US5227818A successfully refreshed from Google Patents.
US5227818A
Expired / Lapsed
US
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Apparatus for determining the contour of the cornea of a human eye
Assignee: VISIOPTIC Inc
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Filing: 1991-09-27
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Granted: 1993-07-13
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Expires: 2011-09-27
Abstract
Abstract There is disclosed apparatus which comprises a corneal topographer including a video camera or charge-coupled-device camera system for sensing images of rings of light reflected from the cornea, and means for processing the image rings to produce data useful in determining the contour of the cornea of a human eye.
Inventors
- 👤 Sami G. El Hage
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:49
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/10; A61B3/107; A61B3/0075
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
165 words
A corneal topographer, comprising a housing having an open end, a body of transparent material having a frusto conically shaped opening therethrough and disposed within the housing with its outer, larger end adjacent the open end of the housing, the inner surface of the opening having an opaque covering which is interrupted along its length to form spaced apart, coaxial, transparent slits, a light source within the housing adjacent the inner end of the body, means forming a space within the housing in which the outer surface of the body and light source are enclosed to confine the transmission of light from the source through the slits, and camera means for sensing the reflected rings of light and for converting the light rings to video signals, said camera means having a lens axially aligned with the inner, smaller end of the body of transparent material and a monitor for receiving the video signals and displaying images of the rings that are reflected from the cornea.
Claim 2
Dependent Claim
165 words
A corneal topographer, comprising a housing having an open end, a body of transparent material having a frusto conically shaped opening therethrough and disposed within the housing with its outer, larger end adjacent the open end of the housing, the inner surface of the opening having an opaque covering which is interrupted along its length to form spaced apart, coaxial, transparent slits, a light source within the housing adjacent the inner end of the body, means forming a space within the housing in which the outer surface of the body and light source are enclosed to confine the transmission of light from the source through the slits, and camera means for sensing the reflected rings of light and for converting the light rings to video signals, said camera means having a lens axially aligned with the inner, smaller end of the body of transparent material and a monitor for receiving the video signals and displaying images of the rings that are reflected from the cornea.
Claim 3
Dependent Claim
42 words
A corneal topographer as described in claim 1, wherein the body of transparent material has an outer cylindrical surface coaxial to the opening therethrough and an outer end surface opposite the light source which is perpendicular to the axis of the opening.
Claim 4
Dependent Claim
31 words
A corneal topographer as described in claim 1, wherein the slits are spaced apart axially of the opening distances which decrease in a direction toward the larger end of the opening.
References Cited (Backward Citations)
US3797921A
Cited
US4569576A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-07-12 | 1997-01-11 | 1997-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-07-12 | 2001-01-11 | 2001-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-07-12 | 2005-01-11 | 2005-07-13 | $7700.00 | Window Closed / Lapsed |