title: The comparative value of the Keely plates in diabetic retinopathy. A preliminary report.
mesh_terms: D000328:Adult; D000368:Aged; D003119:Color Perception Tests / Q000379:methods; D003117:Color Vision Defects / Q000175:diagnosis / Q000209:etiology*; D003930:Diabetic Retinopathy / Q000150:complications*; D005069:Evaluation Studies as Topic; D006801:Humans; D008875:Middle Aged