Ophthalmoscopy: an investigative challenge.
D003930:Diabetic Retinopathy / Q000175:diagnosis*; D006801:Humans; D006973:Hypertension / Q000175:diagnosis*; D009887:Ophthalmoscopy; D012166:Retinal Hemorrhage; D012171:Retinal Vessels; D014652:Vascular Diseases / Q000175:diagnosis*