Influence of the characteristics of tear film break-up on the point spread function of an eye model

Henryk T. Kasprzak; Tomasz J. Licznerski

doi:10.1117/12.353091

14 July 1999 Influence of the characteristics of tear film break-up on the point spread function of an eye model

Henryk T. Kasprzak, Tomasz J. Licznerski

Proceedings Volume 3820, 11th Slovak-Czech-Polish Optical Conference on Wave and Quantum Aspects of Contemporary Optics; (1999) https://doi.org/10.1117/12.353091
Event: Eleventh Slovak-Czech-Polish Optical Conference on Wave and Quantum Aspects of Contemporary Optics, 1998, Stara Lesna, Slovakia

Abstract

The paper presents the complex structure of the human tear film. From the optics point of view the homogeneously distributed tear film on the corneal surface makes this diffused surface optically smooth. Every eye blink distributes a new portion of tears on the surface of the cornea or the contact lens. If the production of tears is not sufficient or their composition is inappropriate, the tear film is deteriorated and so called tear film break-up (TFBU) appears on the surface of the cornea. These local break-ups of the smooth tear film introduce disturbances in the phase of a quasiplane wavefront falling on the cornea from a far-located point source of light. Two types of the TFBUs are considered in this paper. Topography of a point one and a linear one form of the break ups are approximated by use of four different continuous functions. The modeled topography of the TFBU is used for calculation of the local variation of the wavefront phase. The Point Spread Function of the eye model is calculated by use of the Fast Fourier Transform without and with the different approximations of TFBUs. It is shown that different type of TFBU approximation influences significantly the form of the Point Spread Function of the eye.

Citation Download Citation

Henryk T. Kasprzak and Tomasz J. Licznerski "Influence of the characteristics of tear film break-up on the point spread function of an eye model", Proc. SPIE 3820, 11th Slovak-Czech-Polish Optical Conference on Wave and Quantum Aspects of Contemporary Optics, (14 July 1999); https://doi.org/10.1117/12.353091

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