Spider-web placido pattern
AssigneeBausch & Lomb Incorporated
InventorsGregg D. Niven, Joseph R. Bentley, Barry T. Eagan, Lloyd Caldwell, Lloyd Allred
Life of this patent
Estimating the term…
Abstract
A placido pattern 10 for use in obtaining a topography of an eye, includes a series of spaced arcuate segments 12 centered about a central point 14 and a series of spaced radial lines 16 emanating from the central point 14. Each pair of adjacent radial lines 16 defines a boundary of a portion of the arcuate segments 12.
Claims14
A placido pattern for use in obtaining a topography of an eye comprising:
- a series of spaced arcuate segments centered about a central point;
- and
- a series of spaced radial lines emanating from the central point, such that each pair of adjacent radial lines defines a boundary of a portion of the arcuate segments.
A placido pattern for use in obtaining a topography of an eye comprising:
- a series of spaced concentric rings centered about a central point;
- and
- a series of spaced radial lines emanating from the central point, such that a plurality of wedge-shapes are formed with a plurality of spaced arcuate segments within each wedge-shape.
A placido pattern for use in obtaining a topography of an eye comprising:
- a series of spaced concentric rings centered about a central point;
- and
- a series of spaced radial spoke-like lines emanating from the central point, such that the rings and lines form a spider-web-like pattern.
A topography system for use in obtaining a topography of an eye comprising:
- an instrument for measuring a surface topography of a cornea;
- a light source associated with the instrument;
- and
- a placido pattern projected on the cornea by the light source and detected by the instrument for obtaining a topography of the cornea wherein the placido pattern includes:
- a series of spaced concentric rings centered about a central point;
- and
- a series of spaced radial lines emanating from the central point, such that a plurality of wedge-shapes are formed with a plurality of spaced arcuate segments within each wedge-shape.
Dependencies are inferred from the claim text.