COMPARISON OF SCHEIMPFLUG CAMERA IMAGING PATTERNS AND PARAMETERS OF PELLUCID MARGINAL DEGENERATION AND KERATOCONUS

Authors : Ayşe Güzin TAŞLIPINAR UZEL, Yeşim ASLAN ALTAY, Ahmet ŞENGÜN

Pages : 388-392

Doi:10.18229/kocatepetip.1173932

View : 45 | Download : 83

Publication Date : 2023-10-09

Article Type : Research Paper

Abstract :OBJECTIVE: This study aims to compare the topography patterns and parameters in eyes with pellucid marginal degeneration insert ignore into journalissuearticles values(PMD); and eyes with keratoconus insert ignore into journalissuearticles values(KC);. MATERIAL AND METHODS: This study is a retrospective and comparative study. Twenty-nine eyes of 15 patients with PMD and 46 eyes of 25 patients with keratoconus insert ignore into journalissuearticles values(KC); underwent examination. Topographic patterns of axial curvature, anterior and posterior elevation maps, and pachymetric maps obtained by the Scheimpflug camera were categorized. RESULTS: In eyes with PMD, the crab-claw pattern insert ignore into journalissuearticles values(93.1% of all axial curvature map patterns); was the most prevalent. The most common patterns in eyes with KC were inferior insert ignore into journalissuearticles values(41.3%); and central insert ignore into journalissuearticles values(39.1%); steepening patterns. In eyes with PMD, the asymmetric island pattern insert ignore into journalissuearticles values(96.6%); was the most prevalent pattern in elevation maps. Asymmetric incomplete ridge pattern insert ignore into journalissuearticles values(54.3%);, center island insert ignore into journalissuearticles values(17.4%);, and asymmetric regular ridge pattern insert ignore into journalissuearticles values(15.2%); were the most common elevation map patterns in eyes with KC. Among pachymetric map patterns, the decentred oval pattern was most frequent in eyes with PMD, paracentral oval pattern insert ignore into journalissuearticles values(54.3%);, and decentred round pattern insert ignore into journalissuearticles values(34.8%); in eyes with KC. The result of the receiver operating characteristics insert ignore into journalissuearticles values(ROC); graphs showed that the anterior and posterior asphericity insert ignore into journalissuearticles values(Q); values had the maximum area under the ROC curve insert ignore into journalissuearticles values(0.98 and 0.93 respectively); in discriminating PMD and KC. CONCLUSIONS: The crab-claw pattern for the axial curvature map, asymmetric island pattern for the anterior and posterior elevation map, and decentred oval pattern for the pachymetric map were frequently observed in eyes with PMD. Asphericity values of the cornea may be clinically relevant parameters for effectively discriminating PMD from KC.
Keywords : Corneal diseases, Keratoconus, Corneal topography