Method and device for determining cornea surface topography

Details Method and device for determining cornea surface topography Method and device for determining cornea surface topography

A - Human Necessities

61

B

88/121.5

A61B 3/00 (2006.01)

Patent

CA 1187729

METHOD AND DEVICE FOR DETERMINING CORNEA SURFACE TOPOGRAPHY Abstract A device for determining the topography of the cor- nea surface, realizing a method for determining the cor- nea surface topography, comprises a frame carrying a light source, an objective lens, a light detector, and an array of measuring marks. Said array of measuring marks is a combination of two mark groups, one group being a plurality of ring-shaped marks arranged one after another, axially along the frame and perpendicular to the lens optical axis, while the other group is a plurality of li- nes arranged lengthwise along the frame to intersect every ring mark and produce, in the light detector, an image con- sisting of concentric annular patterns and intersecting lines of the radial grid. After a flat image of the array image is obtained, coordinates of image points are measur- ed for specific topographic angles, and corrections are introduced in accordance with the curvature of the radial grid lines.

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