A Mathematical Model of a Placido Disk Keratometer and its Implications for Recovery of Corneal Topography

Richard Rand; Raymond A. Applegate; Howard C. Howland

doi:10.1364/VSIA.1997.FC.4

Vision Science and its Applications
Technical Digest Series (Optica Publishing Group, 1997),
paper FC.4
•https://doi.org/10.1364/VSIA.1997.FC.4

A Mathematical Model of a Placido Disk Keratometer and its Implications for Recovery of Corneal Topography

Richard Rand, Raymond A. Applegate, and Howard C. Howland

Vision Science and its Applications 1997

Santa Fe, New Mexico United States
31 January–3 February 1997
ISBN:

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Corneal Topography (FC)

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R. Rand, R. A. Applegate, and H. C. Howland, "A Mathematical Model of a Placido Disk Keratometer and its Implications for Recovery of Corneal Topography," in Vision Science and its Applications, Technical Digest Series (Optica Publishing Group, 1997), paper FC.4.

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Abstract

We derive and obtain approximate solutions to the equations for a placido disk keratometer relating the ring targets to their images. In addition, we present corneal surfaces that cannot be determined solely by the use of placido ring images, but rather that require for their determination radial elements in the target pattern.

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