الفهرس 
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Abstract
Corneal refractive surgery is the most performed ophthalmic procedure
in the world. Despite the huge leaps in advancing this technology to reduce the
risks of intraoperative and postoperative complications, there is still a very small
risk to develop sight threatening complication such as cornea ectasia.
Corneas at risk of ectasia are usually thinner with abnormal
topographies, but some normal thin corneal with normal topographies have
developed ectasia, a distinction sometimes hard to make between myopia with
such corneas and subclinical cases of keratoconus or forme frust keratoconus.
The values of corneal hysteresis and corneal resistance factor with the
study of the waveform generated by the Ocular Response Analyzer, is a new tool
that could help detect corneas with a suspicious weak structure, such as
keratoconus, forme frust keratoconus and corneas undergone refractive surgery.
This biomechanical study should not be used as the sole test to detect the
suitability of the eyes for refractive surgery but as an adjunct to the clinical and
topographical test.
This is a small prospective clinical interventional series study carried out
from March 2014 to March 2015 on 39 eyes of 22 patients.