Very often it is simply necessary. Premature babies can suffer from retinopathy of prematurity. A prompt diagnosis allows to bring it under control. In case of children with a low birth weight (1000 grams or less) who were born prematurely a screening for this disease is required (in the 4th, 8th and 12th week and at the age of one year). Ophthalmological assessments of babies are also necessary, if parents notice something alarming (which we describe below).