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Proceedings Paper

Phase-transparency model of an eye optical system
Author(s): Vasyl V. Molebny; Igor H. Chyzh; Vyacheslav M. Sokurenko; S.V. Molebny; Ioannis G. Pallikaris; Leonidas P. Naoumidis
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Paper Abstract

Measurement of refraction distribution in the human eye opens new opportunities to make photorefractive surgery more accurate due to accounting imperfections not only of the cornea, but of the eye as an optical system. To calculate the to-be-ablated cornea layers, mathematical relations must be found between measured coordinates of retina ray tracings and transfer function of an eye. A new concept for modeling eye optical system is proposed using four phase transparencies, each of them exercising its own function: accommodation (equivalent to varifocal system), image focusing on the retina (optical system with constant optical power), regular aberrations (spherical and chromatic, astigmatism), and irregular phase distribution. It is shown, how the parameters, necessary for phase transparencies description, can be derived from direct and indirect measurements. Results of modeling experiment with simplified set of test points showed good sight correction. Investigated methodology proved to be fruitful even with limited number of test points and restricted length of polynomial approximation. In our refraction mapping system, transfer function reconstruction will use initial information from 65 points.

Paper Details

Date Published: 22 December 1997
PDF: 10 pages
Proc. SPIE 3192, Medical Applications of Lasers in Dermatology, Ophthalmology, Dentistry, and Endoscopy, (22 December 1997); doi: 10.1117/12.297845
Show Author Affiliations
Vasyl V. Molebny, Institute of Biomedical Engineering (Ukraine)
Igor H. Chyzh, Institute of Biomedical Engineering (Ukraine)
Vyacheslav M. Sokurenko, Institute of Biomedical Engineering (Ukraine)
S.V. Molebny, Institute of Biomedical Engineering (Ukraine)
Ioannis G. Pallikaris, Eye Vardinoyannion Institute/Univ. of Crete (Greece)
Leonidas P. Naoumidis, Eye Vardinoyannion Institute/Univ. of Crete (Greece)

Published in SPIE Proceedings Vol. 3192:
Medical Applications of Lasers in Dermatology, Ophthalmology, Dentistry, and Endoscopy
Gregory B. Altshuler; Reginald Birngruber; Marco Dal Fante; Raimund Hibst; Herbert Hoenigsmann; Neville Krasner; Frederic Laffitte, Editor(s)

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