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Article Type

Article

Abstract

keratoconus (KCN) is a non-inflammatory, progressive thinning process of the cornea. It is considered one of the advanced biomechanical changes on the corneal surface, and methods of treatment in late cases are special designed contact lenses or surgical intervention. The objective of this paper is to customize the standard eyeglass lens in a way so that it fits with the abnormal shape and changes of the surface of the cornea of a patient suffering from KCN disease.The proposed method here, based on manual scratching of the external surface of the standard eyeglass lens under supervising of an expert optometrist, where this method is considered as a less expensive and safer. Retrospectively, a nine cases measured before in Al-Amal Center, Baghdad, Iraq and diagnosed with KCN severity using topographical mapping.A zero-lens was assigned to each patient and it was scratched using CC2000 scratch paper. Then the thickness of the lens was measured before and after scratching in the center of the lens and in four different locations of the topography map with dial gage indicators. After that, the results were compared between the manually scratched lens and the topography map of each patient and evaluate the extent of the match between them. The results of this study are that two types of samples were isolated, in the first type the measurements are close between the topography maps of the patient and the measurements on a regular basis from the side of the behavior of the surface with a difference (0.059 - 0.94)As for the second type, points were obtained that moved away from the real behavior of the photographic image, then it was necessary to isolate it and use the values next to it.

Keywords

Refractive error, RE, Keratoconus, KCN, Pentacam, Topography Maps.

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