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Proceedings Paper

Eye investigation with optical microradar techniques
Author(s): Vasyl V. Molebny; Ioannis G. Pallikaris; Leonidas P. Naoumidis; Vitalij N. Kurashov; Igor H. Chyzh
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Paper Abstract

Many problems exist in ophthalmology, where accurate measurements of eye structure and its parameters can be provided using optical radar concept is of remote sensing. Coherent and non-coherent approaches are reviewed aiming cornea shape measurement and measurement of aberration distribution in the elements and media of an eye. Coherent radar techniques are analyzed taking into account non- reciprocity of eye media and anisoplanatism of the fovea, that results in an exiting image being not an auto- correlation of the point-spread function of a single pass, even in the approximation of spatial invariance of the system. It is found, that aberrations of the cornea and lens are not additive, and may not be brought to summary aberrations on the entrance aperture of the lens. Anisoplanatism of the fovea and its roughness lead to low degree of coherence in scattered light. To estimate the result of measurements, methodology has been developed using Zernike polynomials expansions. Aberration distributions were gotten from measurements in 16 points of an eye situated on two concentric circles. Wave aberration functions have been approximated using least-square criterion. Thus, all data were provided necessary for cornea ablation with PRK procedure.

Paper Details

Date Published: 6 August 1997
PDF: 9 pages
Proc. SPIE 3065, Laser Radar Technology and Applications II, (6 August 1997); doi: 10.1117/12.281011
Show Author Affiliations
Vasyl V. Molebny, Institute of Biomedical Engineering (Ukraine)
Ioannis G. Pallikaris, Univ. of Crete Medical School (Greece)
Leonidas P. Naoumidis, Univ. of Crete Medical School (Greece)
Vitalij N. Kurashov, Institute of Biomedical Engineering (Ukraine)
Igor H. Chyzh, Institute of Biomedical Engineering (Ukraine)

Published in SPIE Proceedings Vol. 3065:
Laser Radar Technology and Applications II
Gary W. Kamerman, Editor(s)

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