Examination of tear film smoothness on corneae after refractive surgeries using a noninvasive interferometric method

Dorota Helena Szczesna; Zbigniew M. Kulas; Henryk T. Kasprzak; Ulf Stenevi

doi:10.1117/1.3275850

1 November 2009 Examination of tear film smoothness on corneae after refractive surgeries using a noninvasive interferometric method

Dorota Helena Szczesna, Zbigniew M. Kulas, Henryk T. Kasprzak, Ulf Stenevi

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Journal of Biomedical Optics, Vol. 14, Issue 6, 064029 (November 2009). https://doi.org/10.1117/1.3275850

Abstract

A lateral shearing interferometer was used to examine the smoothness of the tear film. The information about the distribution and stability of the precorneal tear film is carried out by the wavefront reflected from the surface of tears and coded in interference fringes. Smooth and regular fringes indicate a smooth tear film surface. On corneae after laser in situ keratomileusis (LASIK) or radial keratotomy (RK) surgery, the interference fringes are seldom regular. The fringes are bent on bright lines, which are interpreted as tear film breakups. The high-intensity pattern seems to appear in similar location on the corneal surface after refractive surgery. Our purpose was to extract information about the pattern existing under the interference fringes and calculate its shape reproducibility over time and following eye blinks. A low-pass filter was applied and correlation coefficient was calculated to compare a selected fragment of the template image to each of the following frames in the recorded sequence. High values of the correlation coefficient suggest that irregularities of the corneal epithelium might influence tear film instability and that tear film breakup may be associated with local irregularities of the corneal topography created after the LASIK and RK surgeries.

©(2009) Society of Photo-Optical Instrumentation Engineers (SPIE)

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Dorota Helena Szczesna, Zbigniew M. Kulas, Henryk T. Kasprzak, and Ulf Stenevi "Examination of tear film smoothness on corneae after refractive surgeries using a noninvasive interferometric method," Journal of Biomedical Optics 14(6), 064029 (1 November 2009). https://doi.org/10.1117/1.3275850

Published: 1 November 2009

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KEYWORDS

Surgery

LASIK

Eye

Cornea

Interferometry

Linear filtering

Laser therapeutics

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