الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
Primary open angle glaucoma, in its early stage is essentially symptomless, although sometimes patients with higher IOPs have non-descript symptoms such as vague eye ache. The initial symptom may present only at the later stages when extensive field loss develops or central vision is involved
Glaucoma is the main cause for the loss of vision in the world , so the early diagnosis of glaucoma is very important in the possibility of controlling the disease and slow the deterioration .
Glaucoma is a disease that requires a clinical diagnosis. But There is no gold standard for the presence or progression of the disease. Because of the lack of a definitive measure.
newer technologies show promise in offering better detection of glaucomatous change over time.
OCT is a method allows non contact and non invasive examination of the nerve fiber layer of the retina and the optic nerve head inside the eye through the use of coherent light tomography scan of the nerve fiber layer of the retina with pinpoint accuracy.
Structural imaging technology (OCT) have proven to provide clinicians at all level with the ability to assess the optic nerve and RNFL in a standardized , objective and quantitative fashion. OCT has a good accuracy in assessment of RNFL thickness.
The purpose of the current study was to examine the relationship between the most common method of evaluating the ONH by clinical examination (C-D ratio) and the OCT scanning of the RNFL
the average RNFL thickness measured by the Stratus OCT is a useful parameter to discriminate between normal, and early to severe glaucoma eyes.
Retinal nerve fiber loss precedes optic nerve head damage. Examination of the retinal nerve fiber layer (RNFL) is considered essential in the diagnosis as well as monitoring of glaucoma.