الفهرس 
Title : a comparative study
ContentsOnly 14 pages are availabe for public view
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Abstract
Corneal refractive surgery performed by excimer laser has matured considerably and was able to cover from +6 to {u2212}12 diopters of sphere and up to 6 diopters of astigmatism with good, predictable and safe outcomes ⁽³⁾⁽⁴⁾. Hyperopia had been one of the frontiers approached with caution by modern corneal refractive surgeons, but evidence had confirmed its feasibility for up to 7 diopters with acceptable induction of high order aberrations (HOA), equivalent to those induced by previous generations of excimer laser corneal surgical devices in hyperopic corrections up to +3 spherical diopters ⁽⁵⁾