We recently outlined the treatment of diabetic retinopathy by the xenon-arc photocoagulator and argon laser.1 We now discuss who should be referred for this treatment. About 10% of patients attending a general diabetic clinic have a retinopathy which may need treatment.2 Photocoagulation can reduce the incidence of blindness in over 60% of those patients with proliferative retinopathy or diabetic maculopathy.3
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