الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
Central corneal thickness (CCT) is a corneal health indicator and an essential parameter for the characterization of corneal disease. Additionally, it has been reported that CCT aids in estimating corneal barrier and endothelial pump function. KC is a disease characterized by steepening and thinning of the cornea. Accurate measurements of CCT affect the outcomes of refractive surgery, and corneal transplantation. An accurate CCT value is important for IOP measurements adjustment. Also, accurate measurements of the cornea are needed for the diagnosis and monitoring of corneal ectatic diseases such as KC. Due to its relevance, new quantitative and qualitative techniques have been developed for corneal thickness measurement. The Pentacam and ASOCT are noncontact devices with no risk of corneal infection and no need for anesthesia which used for precise measurement of CCT. This study aimed to compare the CCT measurements by Pentacam and Anterior Segment Optical Coherence Tomography (ASOCT). It included sixty eyes of generally free sixty patients of both sexes aged from fifteen to fifty years from the attendees to outpatient clinic of Mansoura ophthalmic center-Mansoura University during the period from November 2017 till July 2019, patients were subdivided into 2 groups: • group A: thirty keratoconic eyes . • group B: thirty normal eyes. In all patients, CCT was evaluated using Pentacam and ASOCT. In both groups, we found the CCT measurements by Pentacam were statistically thicker than those measured by ASOCT. Potential limitations of our study are, firstly, the relatively small sample size (30 eyes for each group) so more studies with larger sample sizes will be needed and, secondly, our population consisting of only healthy patients with normal corneas or with keratoconic corneas. Therefore, in further studies, these devices should be examined in patients with Keratoconic eyes before and after collagen cross-linking treatment, cataract , corneal edema and opacities or after undergoing any corneal refractive surgery. Also more studies with different versions of ASOCT and Pentacam instruments will be needed.