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Copyright © 1977 by the American Diabetes Association
1977
Best corrected visual acuity of 20/200 or less in the better eye or reduction of visual field to 20° or less
Paul F Palmberg; Diabetic Retinopathy. Diabetes 1 July 1977; 26 (7): 703–711. https://doi.org/10.2337/diab.26.7.703
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