الفهرس 
Correlation between choroidal thickness and diabetic macular edema using optical coherence tomography
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Abstract
Objectives: This work aims at finding correlation between choroidal thickness and diabetic macular edema. Study Design: Prospective, randomized study on 90 eyes divided into 3 groups; NPDR without and with DME and a control group; 30 patients in each. Choroidal thickness (CT) compared at 9 points using optical coherence tomography. Results: Mean SFCT was more than the mean central subfield thickness (CST) with a significant difference of (P= 0.006) in group C, and (P=0. 003) in group A. In group B, CST was more than SFCT but with no significance (P=0. 092). Also, there was no significant difference in SFCT or parafoveal choroidal thickness between control, NPDR with DME groups as the mean SFCT in the control group was 252±50æm, in the NPDR group it was 260.6±49.2æm while in the DME groups, SFCT was 259±50.8æm. Significant increase in SRD-type was detected as compared to other DME types, control and NPDR groups. Conclusion: Choroidal thickness (CT) showed significant difference with the retinal thickness in normal, NPDR patients, and patients with NPDR and DME.There was no significant difference in SFCT or parafoveal choroidal thickness between control, NPDR and DME groups. No correlation was found between SFCT and CST in the three groups. There is significant increase in CT in SRD- type compared to other DME types, control and NPDR groups