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LASIK and PRK Representative 6 month results Table 1 (Part One) Clinical Outcomes at 6 mos after Surgery 20/20 or Better Uncorrected Vision 20/25 or Better Uncorrected Vision 20/40 or Better Uncorrected Vision LASIK for Nearsightedness: -0.75 to -1.99 81% 93% 99% -2.00 to -3.99 77% 91% 99% -4.0 to -5.99 74% 90% 99% -6.0 to -7.99 66% 86% 98% -8.0 to -9.99 62% 75% 95% LASIK for Farsightedness: +0.5 to +0.99 68% 90% 99% +1.0 to +2.5 65% 77% 96% +2.5 to +4.0 57% 70% 90% PRK for Nearsightedness: -0.75 to -1.99 81% 92% 99% -2.0 to -3.99 74% 90% 98%

Even though LASIK and PRK are approved by the FDA up to 14 diopters of nearsightedness and 6 diopters of farsightedness, we no longer correct more than approximately 10 diopters of nearsightedness or 4 diopters of farsightedness because of poor predictability for higher corrections and increased risk of complications such as glare, halos, and decreased quality of vision after correction of high nearsightedness and farsightedness.

LASIK and PRK Representative 6 month results Table 1 (Part Two) Clinical Outcomes at 6 mos after Surgery +/-1 Diopter Final Refractive Error Eyes Losing 2 or More Lines of Best Corrected Vision LASIK for Nearsightedness: -0.75 to -1.99 99% 0 -2.00 to -3.99 98% 0 -4.0 to -5.99 97% 0 -6.0 to -7.99 95% 1 -8.0 to -9.99 94% 1 LASIK for Farsightedness: +0.5 to +0.99 99% 0 +1.0 to +2.5 97% 0 +2.5 to +4.0 95% 1 PRK for Nearsightedness: -0.75 to -1.99 99% 0 -2.0 to -3.99 99% 0