Considering the missing science of retraining and maintenance in medical artificial intelligence, using ophthalmology as an exemplar. - Ariel Yuhan Ong; Robbert R. Struyven; Alastair K. Denniston; David A. Merle; Justin Engelmann; Hyunmin Kim; Yukun Zhou; Pearse A. Keane; Ines Lains (npj Digit. Medicine, 2026)