Eye investigation with optical microradar techniques

Vasyl V. Molebny; Ioannis G. Pallikaris; Leonidas P. Naoumidis; Vitalij N. Kurashov; Igor H. Chyzh

doi:10.1117/12.281011

6 August 1997 Eye investigation with optical microradar techniques

Vasyl V. Molebny, Ioannis G. Pallikaris, Leonidas P. Naoumidis, Vitalij N. Kurashov, Igor H. Chyzh

Proceedings Volume 3065, Laser Radar Technology and Applications II; (1997) https://doi.org/10.1117/12.281011
Event: AeroSense '97, 1997, Orlando, FL, United States

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.

Citation Download Citation

Vasyl V. Molebny, Ioannis G. Pallikaris, Leonidas P. Naoumidis, Vitalij N. Kurashov, and Igor H. Chyzh "Eye investigation with optical microradar techniques", Proc. SPIE 3065, Laser Radar Technology and Applications II, (6 August 1997); https://doi.org/10.1117/12.281011

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