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L. Shi, B. Tan, Y.-L. Chen, J. W. L. Lewis, M. Wang; Tear Film Breakup in Dynamic Infrared Photorefraction (DIP). Invest. Ophthalmol. Vis. Sci. 2009;50(13):1581.
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In the past 2 years, we have demonstrated that DIP is a cost effective method for keratoconus screening. Similar to retinoscopy, the retinal reflex carries information of both low- and high-order aberrations that can be detected and analyzed using Zernike analysis. This study examines the influence of tear film breakup on the results of the analysis.
The multi-meridian and -eccentricity DIP technique is employed to image the same eyes both with and without film breakup. For each set of measured data, the pupillary reflex images are obtained and rotated to the corresponding detection meridians. Excluding the cornea reflection, the reflex images are rescaled to their maximum and minimum intensity and then decomposed into Zernike components to the 6th order. The percentage contribution from each aberration order is calculated and compared in the 2 groups.Result &
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