When to refer to an ophthalmologist.
D000368:Aged; D002386:Cataract / Q000175:diagnosis; D003930:Diabetic Retinopathy / Q000175:diagnosis; D005128:Eye Diseases / Q000175:diagnosis*; D005260:Female; D005901:Glaucoma / Q000175:diagnosis; D006801:Humans; D008297:Male; D011320:Primary Health Care; D012017:Referral and Consultation