Research Papers

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

[+] Author Affiliations
Dorota H. Szczesna

Wroclaw University of Technology, Institute of Physics, Wybrzeze Wyspianskiego 27, Wroclaw 50-370, Poland

Zbigniew Kulas

Wroclaw University of Technology, Institute of Telecommunication, Wybrzeze Wyspianskiego 27, Wroclaw 50-370 Poland

Henryk T. Kasprzak

Wroclaw University of Technology, Institute of Physics, Wybrzeze Wyspianskiego 27, Wroclaw 50-370 Poland

Ulf Stenevi

Sahlgren’s University Hospital, Department of Ophthalmology, Gunebogatan, Mölndal, SE-431 80, Sweden

J. Biomed. Opt. 14(6), 064029 (December 28, 2009). doi:10.1117/1.3275850
History: Received March 10, 2009; Revised October 08, 2009; Accepted October 09, 2009; Published December 28, 2009; Online December 28, 2009
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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.

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© 2009 Society of Photo-Optical Instrumentation Engineers

Citation

Dorota H. Szczesna ; Zbigniew Kulas ; Henryk T. Kasprzak and Ulf Stenevi
"Examination of tear film smoothness on corneae after refractive surgeries using a noninvasive interferometric method", J. Biomed. Opt. 14(6), 064029 (December 28, 2009). ; http://dx.doi.org/10.1117/1.3275850


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