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Background:The Multicenter Trial of Cryotherapy for Retinopathy of Prematurity (CRYO-ROP) demonstrated the efficacy of treatment for threshold ROP and indicated the need for worldwide ROP screening. Previous guidelines for ROP screening have been largely based on clinical impression; we can now develop evidencebased screening recommendations.Objective: To define the appropriate ages and retinal ophthalmoscopic signs that determine when to commence and conclude acute phase ROP screening.

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The effect of high-dosage E treatment (Rx) initiated at the stage of 3-plus active disease (target serum E levels, 5-6 mg/dl) was evaluated by a standardized scoring system of visual morbidity at the one to two year eye exam among infants cared for in the University of Pennsylvania Neonatal Complex (1976-1978). The incidence of legal blindness in both eyes or worse was decreased from 71 to 40% in E Rx (n = 10) as compared to non-E Rx (n = 14) infants, and the number of infants with minimal visual morbidity was increased. Pilot studies (1972-76; target serum E level, 1.5 and 3.0 mg/dl) of the prophylactic effect of E Rx from birth on showed a decrease in mean severity of acute stage disease and a decrease in sequelae at one to two years. A strikingly difference in visual morbidity following resolved low-grade ROP was seen when prestudy infants (1968-72) who were fed early iron supplements and given formulas with low E:PUFA ratios were compared to non-E Rx as well as to E Rx 1972-76 infants. Vitamin E seems to exert a beneficial effect at all stages of ROP, perhaps because of its broadly based regulatory role.