الفهرس 
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Abstract
Central corneal thickness is an important indicator of health status of the cornea especially of corneal endothelial pump function (1),
The normal thickness of the cornea varies from central to peripheral limbus and it is ranging from 0.7 to 0.9 mm at the limbus and it is range at the centre from 0.49 mm to 0.6 mm. (130)
Normal ordinary CCT is around 540μm and for the most part, consists of the corneal stroma, which is estimated to be 450μm in the center. This stroma gives essential structural integrity and plays a significant function in keeping up corneal transparency (2).
Central corneal thickness usually is measured by ultrasonic pachymeter. With late advances, it is possible to measure this value by Pentacam, which maps the whole surface of the cornea (131). Corneal tomography has the ability to measure not only the anterior corneal surface but also the posterior surface, allowing a three-dimensional image of the cornea. This technology provides significantly more information than anterior surface topography, as tomography utilizes data from anterior and posterior surfaces of the cornea, as well as pachymetric mapping.
It is an important factor to assess the suitability in refractive surgeries as it is used to exclude patients at risk of postoperative ectasia (132).
418 eyes of 209 patients were included in this study who came asking for refractive surgery for which corneal topography with rotating Scheimpflug device was done. Evaluation of the following
Summary
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parameter central corneal thickness, k1, k2, Kmax and the refractive error were studied.
In our study there were highly statistically significant correlation between SE, k2, kmax and CCT.
Also, there was statistically significant correlation between k1, cylinder and CCT.
Also, there was statistically significant correlation between all refractive error, refractive error according to SE and CCT.
There is non-statistically significant correlation between age, sex and CCT.