Clinically, Gass proposed a classification for ERM:
Grade 0: cellophane maculopathy, in which a translucent epiretinal membrane is not associated with distortion of the inner retina;
grade 1: crinkled cellophane maculopathy, in which the inner retinal surface is distorted by a thin membrane;
grade 2: macular pucker, in which the membrane is thicker, with a distinct grayish appearance, and obscures underlying vessels, causing marked distortion of the retina.
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