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US 5,517,261 AGranted
Focusing method for a corneal topographer
AssigneeAlcon Laboratories, Inc.
InventorsAsif Sharif, Daniel R. Peters, Keming Lu, Sami El Hage
Life of this patent
Estimating the term…
Abstract
A method for focusing a corneal topographer by determining the maximum intensity of a reflected light during a first focusing sweep and capturing the topographic image during a second sweep when the reflection intensity reaches the maximum intensity.
Claims6
A method for focusing a corneal topographer, comprising the steps of:
- a. reflecting a light off of a cornea;
- b. adjusting the topographer so that a reflection of the light is first brought into focus and subsequently out of focus;
- c. measuring an intensity of the reflection of the light while the reflection of the light is brought into and out of focus;
- d. determining a maximum intensity of the reflection of the light;
- e. adjusting the topographer a second time so that the reflection of the light is brought back into focus;
- f. reflecting a concentric ring pattern off of the cornea when the maximum intensity is reached during the second time the reflection of the light is brought into focus;
- and
- g. capturing the reflection of the concentric ring pattern.
5 more elements
A method for focusing a corneal topographer, comprising the steps of:
- a. reflecting a light from a light emitting diode off of a cornea;
- b. adjusting the topographer so that a reflection of the light is first brought into focus and subsequently out of focus;
- c. measuring an intensity of the reflection of the light while the reflection of the light is brought into and out of focus;
- d. determining a maximum intensity of the reflection of the light;
- e. adjusting the topographer a second time so that the reflection of the light is brought back into focus;
- f. reflecting a concentric ring pattern off of the cornea when the maximum intensity is reached during the second time the reflection of the light is brought into focus;
- and
- g. capturing the reflection of the concentric ring pattern with a CCD camera.
5 more elements
Dependencies are inferred from the claim text.