Ophthalmologists (Eye MD’s) who are skilled in the evaluation of infant eyes make the diagnosis of ROP. They examine the eyes after the pupils are dilated with drops. There is active research evaluating the effectiveness of digital photography for diagnosing ROP. Infants less than 1500 grams (3.3 lbs) and with a gestational age less than 31 weeks undergo eye examinations to monitor for ROP. Other infants who are deemed high risk by the neonatologist might also be screened.