Subfoveal choroidal thickness in eyes with diabetic macular oedema using swept source optical coherence tomography.

Purpose: To compare subfoveal choroidal thickness (GCSF) in patients with diabetic macular oedema (DMO) and healthy subjects using swept source optical coherence tomography (SS-OCT).

Method: Cross-sectional study including 50 eyes of 36 patients with DMO, and 47 eyes of 34 patients as a control group. GCSF was measured in both groups, analysing between the eyes with DMO according to the type of oedema (predominantly cystic or diffuse).

Results: The study groups were homogeneous in terms of mean age (63.4 years for DMO and 62.65 years for controls; P=.36) and the mean axial length (23.21mm for DME and 23.53mm for controls; P=.06). A statistically significant reduction in the eye with DME GCSF compared to controls (P=.041, 222.9 vs. 192.82 μm) was observed. No statistically significant differences were observed in the eyes with DMO with a predominantly cystic pattern and diffuse oedema (P=.13, 178.68 vs. 205.7 μm).

Conclusion: The GCSF in patients with DMO could be reduced. Future studies are needed to confirm these preliminary results.