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To the Editor.
—The case report in the May 1989 issue of the Archives by McDonald et al concerning excimer laser ablation of the cornea for the correction of a refractive error of −5.00 diopters of myopia was most interesting. I would appreciate it if the authors would respond to several questions and comments.The central thickness of the tissue removed was 0.12 mm (0.5 − 0.38 = 0.12) and the diameter of the tissue removed was 5.00 mm. The amount of stroma removed by Barraquer myopic keratomileusis in this case would be only about 0.07 mm. Since a residual central corneal thickness of less than 0.30 mm risks ectasia, the amount of resected tissue limits the power of the correction possible (assuming constant diameter of the ablated or resected tissue). Larger ablation diameters necessitate greater sagittal depths of tissue removal.Can the authors explain the gradual thinning of the cornea
Nordan LT. Functional Blindness in Photorefractive Keratectomy. Arch Ophthalmol. 1989;107(11):1563–1564. doi:10.1001/archopht.1989.01070020641003
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