Synthetic Wavefront Interferometry: Auto-Refraction Keratopography And Pachytopography

Larry S. Horwitz; William A. Haas; Kenneth W. Lowe; John Householder

doi:10.1117/12.952018

11 September 1989 Synthetic Wavefront Interferometry: Auto-Refraction Keratopography And Pachytopography

Larry S. Horwitz, William A. Haas, Kenneth W. Lowe, John Householder

Proceedings Volume 1066, Laser Surgery: Advanced Characterization, Therapeutics, and Systems; (1989) https://doi.org/10.1117/12.952018
Event: OE/LASE '89, 1989, Los Angeles, CA, United States

Abstract

A Synthetic WaveFront Interferometer (SWFI) technique has been developed that when utilized can provide simultaneous refraction, pachymetry and keratometry measurements from a single instrument. The corneal topography and thickness measurements are provided globally, i.e., as a continuous measurement over the entire corneal region. The technology involves the utilization of three distinct illumination wavelengths that provide strong separable reflections from the epithelial, endothelial and retinal regions of the eye. Synthetic wavefronts are developed by the impingement of the spectral wavefront containing the phase information onto a single1Ronchi grating (ruling) after reflection from the respective surfaces. Moire patterns (or, SWFI patterns) are produced when these wavefronts impinge on a second Ronchi grating. Computerized analysis of the patterns provide the respective measurements in a clinically usable form. The instrument is not sensitive to mechanical shock, vibrations or misalignment. Thus, it is totally compatible with clinical use.

Citation Download Citation

Larry S. Horwitz, William A. Haas, Kenneth W. Lowe, and John Householder "Synthetic Wavefront Interferometry: Auto-Refraction Keratopography And Pachytopography", Proc. SPIE 1066, Laser Surgery: Advanced Characterization, Therapeutics, and Systems, (11 September 1989); https://doi.org/10.1117/12.952018

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KEYWORDS

Wavefronts

Moire patterns

Cornea

Eye

Laser therapeutics

Phase measurement

Reflection

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