الفهرس 
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Abstract
This study aims to investigate the effect of central corneal thickness and corneal curvature in patients with keratoconus on the ocular tension measurements taken by different tonometric devices to assess the agreement between them in the ocular tension.This study includes keratoconic patients in the different stages including the clinical and topographic signs and exclude those with glaucoma, previous refractive surgery, corneal ulcer and apical corneal scar.The ocular tension was assessed by tonometric devices . Central corneal thickness and curvature were assessed by TMS-5.