Corneal Topography Research of Myopia in Chinese

Purpose: To determine corneal topography parameters of myopia in Chinese and help for studies of causes of myopia, distingiush other corneal diseases (such as early keratoconus), further explore the accurateness and safeness of the clinical effects of radii keratotomy(RK) or photorefractive keratectomy (PRK). Methods: Fifty-eight eyes with mild or moderate myopia were examined by computer-assisted photokeratography. (TMS-1 Computed Anatomy Inc. New York. NY)Results: The corneal topography of most (68%) of the examined eyes showed symmetric bowtie pattern; the corneal surface of most (75%) of the examined eyes showed positive aspheric shape (steeper centrally, flatter peripherally); the refractive power of central cornea is at mean 44. 165 ± 1. 429D; the refractive difference between 1 to 25 ring in keratoscpe was at mean 1. 655 ± 0. 785D; the mean SRI was 0. 558 ± 0. 768, the mean SAI was 0. 296 ± 0. 149; the mean Smik was 44. 209±1. 515D. The apex and visual axis were dislocation in all the cornea

Corneal Topography Research of Myopia in Chinese