Corneal Topography and Radial Keratotomy

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Abstract
Computer scanning of twelve-ring photokeratoscopy yields corneal curvature measurements at multiple loci. In order to understand corneal changes resulting from radial keratotomy (RK), scanning of preoperative and postoperative photokeratographs was performed. Radial keratotomy flattens most of the cornea, but the greatest degree of flattening occurs centrally. Radial keratotomy also changes the nature of corneal asphericity. Instead of the peripheral flattening one observes with the normal cornea, peripheral steepening occurs after radial keratotomy. In comparing the effects of different optical zone sizes, the area of greatest activity is represented by rings one through five.