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Proceedings Paper

Examination of in vivo tear film stability after eye blink and eye drying
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Paper Abstract

The purpose of this study is to investigate the kinetics of precorneal tear film stabilization process after eye blink and the process of creating the break-up of the tear film layer. The tear film of patients were examined in vivo by used the lateral shearing interferometer. The information about the distribution and stability of the tear film over the cornea is carried by the wave front reflected from the surface of tears and coded in interference fringes. Smooth and regular fringes indicate the smooth surface of tears over the cornea. Immediately after eye blink the interference fringes are observed on background of bright and dark areas. The contrast of this structure fades with time slowly and after 1-3 sec the background of interference fringes becomes uniform. The vertical orientation and instability of this structure suggests connection with eyelid movement and the spread of tears. If the eye is kept open for a long time, bright lines appear in the background of fringes after a dozen seconds. The slowly appearing structure might signify the tear film break-up. In case of eyes after a LASIK surgery the shape of the background structure has different nature and might be stable in time suggesting the stability of the corneal surface irregularities.

Paper Details

Date Published: 13 July 2007
PDF: 8 pages
Proc. SPIE 6633, Biophotonics 2007: Optics in Life Science, 663314 (13 July 2007); doi: 10.1117/12.728384
Show Author Affiliations
Dorota H. Szczesna, Wroclaw Univ. of Technology (Poland)
Zbigniew Kulas, Wroclaw Univ. of Technology (Poland)
Henryk T. Kasprzak, Wroclaw Univ. of Technology (Poland)
Ulf Stenevi, Sahlgren's Univ. Hospital (Sweden)

Published in SPIE Proceedings Vol. 6633:
Biophotonics 2007: Optics in Life Science
Jürgen Popp; Gert von Bally, Editor(s)

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