الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
SUMMARY
The cornea is the transparent tissue covering the front of the eye. It is a powerful refracting surface, providing 2/3 of the eye’s focusing power. The adult cornea is only about 1/2 millimeter thick and is comprised of 6 layers: epithelium, Bowman’s membrane, stroma, Dua’s layer, Descemet’s membrance and endothelium
The cornea, as a part of the coat of the eye, reflects the biomechanical properties of other tissues of the eye such as the sclera or the lamina cribrosa that could make the eye susceptible to glaucomatous damage.
The cornea, as it is easy accessible, plays an important role in diagnosis and management of many ocular diseases. A variety of corneal investigations are available, but none of them take corneal physiological biomechanics into consideration.
IOP might considered the only modifiable risk factor for glaucoma so accurate IOP assessment is mandatory
Corneal biomechanics could be regarded as an indirect measurement of corneal rigidity.
Our study was made to assess the correlation between corneal biomechanics Parameters (CH,CRF,IOPg andIOPcc) with visual field affection , OCT optic disc and IOPGAT in primary open angle glaucoma
Our study revealed that the corneal biomechanics Parameters are significantly lower in patients with advanced primary open angle glaucoma (POAG) .
For many years ophthalmologist use CCT, corneal topography, tomography and many other parameters as risk indicators in corneal pathologies, surgeries and glaucoma, but the relationship is not linear or clear. Actually these corneal parameters act as estimations of corneal physiological viscoelastic biomechanical properties.
The ocular response analyzer (Reichert Ophthalmic instruments, Buffalo, NY) is the first simple device able to provide an in vivo dynamic measurement of the corneal viscoleastic biomechanical properties. The ORA provides the measurement of accurate IOP and two indicators of corneal biomechanical properties CH and CRF.
Taking corneal biomechanical properties into account provides unique insight into glaucoma and they have great potential to improve risk analysis, decision-making and prognosis, moreover it is important for accurate IOP measurement.
Finally, studying corneal biomechanics is essential to enrich our ophthalmic knowledge and make better understanding of corneal pathologies, surgeries and glaucoma.