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  • Title: Wavefront sensing and the dynamics of tear film.
    Author: Koh S, Maeda N.
    Journal: Cornea; 2007 Oct; 26(9 Suppl 1):S41-5. PubMed ID: 17881915.
    Abstract:
    PURPOSE: To summarize our previous studies regarding the influence of tear-film dynamics on optical quality after blinking. METHODS: Sequential higher-order aberration (HOA) measurements were performed by using a wavefront sensor. During the measurements, subjects were asked to blink every 10 seconds. The obtained aberration data were analyzed in the central 4-mm diameter for coma-like, spherical-like, and total HOAs up to the sixth-order Zernike polynomials. RESULTS: Serial measurements of HOAs in healthy eyes showed variations even in clinically normal subjects and were classified into 4 groups by pattern: stable, small-fluctuation, sawtooth, and others. The sequential postblink change in HOAs after punctal plug insertion was quantitatively evaluated in a patient with dry eye who complained of paradoxical visual impairment with epiphora despite improvement of dry eye. CONCLUSIONS: Wavefront sensing is a useful objective method to evaluate sequential changes of visual performance related to tear-film dynamics. Serial measurement of HOAs might show a relationship between tear dynamics and quality of vision clinically.
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