الفهرس 
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Abstract
The present study included 84 eyes of 44 diabetic patients. They were divided into two groups: . Group I: 32 eyes with no evidence of diabetic retinopathy. Group II: 52 eyes with clinically evident diabetic retinopathy. Patients were not considered for this study if they had proliferative diabetic retinopathy, clinically significant macular oedema, glaucoma, high myopia, previous ocular surgery, other retinal vascular diseases and anterior segment opacity. Every patient was subjected to a complete ophthalmological examination, fluorescein angiography and optical coherence tomography. Neither fluorescein angiography nor OCT showed macular oedema in all patients of group I and 15 eyes of group I meanwhile, both methods detected macular oedema in the same 37 eyes of group II. While fluorescein angiography showed leakage of the dye OCT showed increase in the macular thickness that generally correlated with areas of fluorescein leakage. In the present study, retinal thickness was measured manually on non-aligned data. The pattern of difference in the retinal thickness between hemispheres and quadrants remained the same in both groups, but retinal thickness was generally higher in patients with non-proliferative diabetic retinopathy (group II). Statistically significant differences were found at the fovea, the paramacular ring, the superior and temporal hemispheres, and the superior nasal- quadrants. This would suggest that, retinal thickness is more likely to occur at the center than the periphery, the superior and nasal hemispheres than the inferior and temporal ones and at the superior nasal quadrant than the remaining three