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Year : 2018  |  Volume : 19  |  Issue : 3  |  Page : 201-204

Correlation between choroidal thickness and central macular thickness measured by optical coherence tomography in nonproliferative diabetic retinopathy

1 Department of Ophthalmology, Cairo University, Giza, Egypt
2 Department of Ophthalmology, South Valley University, Qena, Egypt

Correspondence Address:
Mohamed A Hamed
Qena Faculty of Medicine, South Valley University, Qena 83523
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/DJO.DJO_12_18

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Purpose To investigate the correlation between central macular thickness (CMT) and subfoveal choroidal thickness (SFCT) measured by spectral-domain optical coherence tomography in nonproliferative diabetic retinopathy (NPDR). Patients and methods This is a prospective observational randomized study (case series) that was performed on 48 eyes of 29 patients having NPDR. The 48 eyes were divided into two groups: group I comprised 28 eyes of diabetic patients having NPDR without macular edema [NPDR without diabetic macular edema (DME)] and group II included 20 eyes of diabetic patients having NPDR with macular edema (NPDR with DME). The patients underwent spectral-domain optical coherence tomography to measure the central subfoveal and parafoveal retinal and choroidal thicknesses. Results The age for group I was 56.18±11.27 years and for group II was 60.35±7.67 years. In group I, the CMT was 297.57±40.66 µm and the central subfoveal choroidal thickness (C-SFCT) was 221.21±40.49 µm. In group II, the CMT was 425.1±136.4 µm and the C-SFCT was 209.65±27.92 µm. In group I, no statistically significant correlation between CMT and C-SFCT was found (r=0.211, P=0.282), suggesting that retinal thickness may not be directly related to the choroidal thickness in this study group. In group II, a weak negative correlation was observed (r=−0.518, P=0.019), indicating that the choroidal thickness may decrease as the central retinal thickness increases in this group. Conclusion There was a statistically significant negative correlation between CMT and C-SFCT in patients with NPDR and DME. The SFCT decreased as the CMT increased. In addition, the subfoveal choroid was thinner in eyes with NPDR and DME than in eyes with NPDR without DME.

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