الفهرس 
ANATOMY OF THE RETINAOnly 14 pages are availabe for public view
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Abstract
O
CT has evolved over the past decade as one of the most important ancillary tests in ophthalmic practice.
OCT makes it possible to obtain noninvasive, rapid, objective, high-resolution, cross-sectional imaging of the retina, the (RNFL) and the optic nerve head and also permits direct, real-time imaging of ocular pathology that previously could not be visualized using traditional methods.
Retinal nerve fiber layer thickness can be affected by various factors such as race, axial length and errors of refraction.
There is a significant change in RNFL thickness (p<0.001) in refractive errors. In myopes there was a progressive thinning of RNFL as the power increased and there was significant increase in the RNFL thickness in Hypermetropes as the power increased. In both myopes and hypermetropes significant changes are seen when the error is more than 3D. At the same time there was statistically significant decrease in the RNFL thickness as the Axial length increased and increase in the thickness as the axial length decreased .
A comparative study included a total of 68 eyes diveided into 45 eyes with errors of refraction and 23 emmetropic eyes in the period from march 2020 to September 2020 divided into 3 groups:
1. Myopic eyes (above -4 D)
2. Hypermetropic eyes (above +4D)
3. Emmetropic eyes
The results found in our study show that there was statistically significant difference in RNFL thickness between myopic eyes, hypermetropic eyes in comparison to emmetropic eyes.
RNFL thickness decreases in myopic eyes in all quadrants except in temporal quadrant, while RNFL thickness increases in hypermetropic eyes in all quadrants except in temporal quadrant.