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J. Bao, J. He, H. Wang, X. Mao, F. Lu; Improvement of Visual Performance by Astigmatism Correction in Myopic Eyes Wearing RGP-Contact Lens. Invest. Ophthalmol. Vis. Sci. 2010;51(13):1534.
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Our previous study has shown that second order Zernike astigmatism in myopic eyes was reduced when rigid-gas-permeable contact lens (RGP-CL) was worn (Lu et al. OVS 2003). The purpose of this study was to test its visual effect of the astigmatism correction during RGP-CL wearing.
Wavefront aberrations of twenty one myopic eyes with astigmatism greater than -0.5D (mean=-0.93±0.38D) were measured using a wavefront sensor (WASCA, Carl Zeiss Meditec) under four conditions: corrected for spherical equivalent with (1) spectacle lens (SL), (2) soft-contact lens (Soft-CL, Surevue, J&J) and (3) rigid-gas-permeable contact lens (RGP-CL, XO, Boston) and fully corrected for both spherical error and astigmatism with (4) spectacle lens (fSL). Both contrast visual acuity (VA) at 100%, 25%, 10% and 5% contrast levels (MFVA-100, Shenzhen BriteEye) and contrast sensitivity function (CSF) at 3, 6, 12 and 18 cpd (CSV-1000E, Vectorvision) were also assessed for the subjects under the same correction conditions as in the wavefront measurement. Difference in contrast VA and CSF under the RGP-CL wear condition from the other three correction conditions was statistically tested.
Mean root-mean-square of total wavefront aberrations from 2nd order up to 7th order at a 6.0mm pupil size for the 21 eyes were 1.09±0.36, 0.88±0.35, 0.63±0.20 and 0.47±0.17µm under the SL, Soft-CL, fSL and RGP-CL conditions respectively. Contrast VA under the RGP-CL condition was significantly improved by a mean of 0.11 and 0.09 logMAR across the 4 contrast levels from those under SL and Soft-CL conditions respectively. The difference in mean contrast VA between the RGP-CL and fSL was only 0.01 logMAR. RGP-CL wear gained mean contrast sensitivity across the four spatial frequencies by 0.14, 0.08 and 0.04 log units against the SL, Soft-CL and fSL wearing conditions. The difference in mean contrast VA between the RGP-CL and the Soft-CL conditions was close to that between fSL and SL conditions (0.09 vs. 0.10 logMAR).
RGP-CL wear corrects astigmatism in myopic eyes and also improves visual performance with the effect compatible with that from astigmatism correction provided by spectacle lens.
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