LASIK Study Results
How often do people get 20/20 vision or better after LASIK?
Data from the clinical trials for the currently used excimer lasers supports the assertion that LASIK surgery works very well for most people. For example, for the most recent trials of Custom LASIK with the VISX S4 laser, the most commonly used excimer laser in the United States, 92% of eyes with low to moderate amounts of mypopia achieved 20/20 or better at 3 months time and 98% achieved vision required for driving without glasses in most states (20/40). Higher levels myopia and hyperopic patients may have a somewhat lower chance of 20/20 vision after the procedure than those with low levels of myopia (See below).
| Visual Acuity without glasses after Custom LASIK with the VISX S4 Excimer Laser in patients with Low to Moderate Myopia (< - 6 Diopters) and Low to Moderate Astigmatism ( < -3 Diopters)* |
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| Of 341 clinical trial eyes: | 1 Month After LASIK | 1 Year After LASIK |
| % with 20/20 vision | 92% | 98% |
| % with 20/40 vision | 98% | 100% |
| Visual Acuity without glasses after Custom LASIK with the VISX S4 Excimer Laser in patients with High Myopia (- 6 to -11 Diopters) and Low to Moderate Astigmatism ( < -3 Diopters)* |
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| Of 184 clinical trial eyes: | 1 Month After LASIK | 1 Year After LASIK |
| % with 20/20 vision | 85% | 86% |
| % with 20/40 vision | 99% | 100% |
| Visual Acuity without glasses after Custom LASIK with the VISX S4 Excimer Laser in patients with Low to Moderate Hyperopia (< + 3 Diopters) and No to Low Astigmatism ( < 2 Diopters)* |
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| Of 144 clinical trial eyes: | 1 Month After LASIK | 1 Year After LASIK |
| % with 20/20 vision | 58% | 72% |
| % with 20/40 vision | 96% | 95% |
