The recovery of the foveal COST line defect is correlated with the BCVA after ERM surgery. The length of the preoperative COST line defect can predict the potential foveal function. (ClinicalTrials.gov number, NCT01549249.).

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The restoration of the temporal COST line was delayed after successful macular hole surgery. In addition, the fovea was displaced more nasally than the center of the COST line defect which recovered centripetally. (ClinicalTrials.gov number, NCT01959776.).