23 September 2005 Novel double path shearing interferometer in corneal topography measurements
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Abstract
The paper presents an approach for measurements of corneal topography by use of a patent pending double path shearing interferometer (DPSI). Laser light reflected from the surface of the cornea is divided and directed to the inputs of two interferometers. The interferometers use lateral shearing of wavefronts in two orthogonal directions. A tilt of one of the mirrors in each interferometric setup perpendicularly to the lateral shear introduces parallel carrier frequency fringes at the output of each interferometer. There is orthogonal linear polarization of the laser light used in two DPSI. Two images of fringe patters are recorded by a high resolution digital camera. The obtained fringe patterns are used for phase difference reconstruction. The phase of the wavefront was reconstructed by use of algorithms for a large grid based on discrete integration. The in vivo method can also be used for tear film stability measurement, artificial tears and contact lens tests.
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Tomasz J. Licznerski, Jaroslaw Jaronski, Dariusz Kosz, "Novel double path shearing interferometer in corneal topography measurements", Proc. SPIE 5959, Medical Imaging, 595917 (23 September 2005); doi: 10.1117/12.641085; https://doi.org/10.1117/12.641085
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