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Outer nuclear layer (ONL) thickness was calculated as the distance between internal limiting membrane (ILM), and external limiting membrane (ELM) at the fovea. The red bar shows the measurement of foveal ONL thickness (defined as the distance from ILM to ELM). Optical coherence tomography (OCT) shows SRF at fovea and thinner ONL (a) than that of the fellow healthy eye (b) at the time of the initial consultation.
