Changes of macular choroidal thickness in the patients with epiretinal membrane (ERM) development (new-onset) and progression by optical coherence tomography (OCT). Combination images of an en face infrared section and a horizontal enhanced depth B-scan of OCT. The average macular choroidal thickness was measured at 15 points with 500 μm intervals from the horizontal scan. (A) A 59-year-old female patient with new-onset and progression of ERM in the left eye. The macular choroidal thickness was 250.0 μm at baseline and decreased significantly to 124.6 μm after 34 months. The choroid-scleral boundary was indicated by the dotted line in the uppermost image. (B) A 65-year-old female patient with marked progression of ERM in the left eye. During the 39-month follow-up period, choroidal thickness was significantly reduced, to approximately 30.4% of the baseline. Scale bar 200 µm.
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