Problems of retinal detachment in retrolental fibroplasia (RLF) based on observations during 10 years of 92 premature children treated with supplemental oxygen in incubators are discussed. Two essential types of retinal detachment can be distinguished: the oedematous type in the stages III–V of the active phase of RLF and the rhegmatogenous type of cicatricial RLF. In our material 2 cases of oedematous detachment, which regressed spontaneously, were found. The case of a 10-year-old boy with total retinal detachment in cicatricial RLF, which was diagnosed too late, is presented. Since good results have been described after scleral buckling procedures in cases diagnosed early enough, all children with RLF should remain under steady control.