Importance While oral vitamin A supplementation is considered to potentially slow loss of
retinal function in adults with retinitis pigmentosa and normal liver function, little data from
children with this disease are available. Objective To compare disease courses in children
with retinitis pigmentosa taking or not taking vitamin A supplementation. Design, Setting, and
Participants Retrospective, nonrandomized comparison of vitamin A and control cohorts
followed up for a mean of 4 to 5 years by the Electroretinography Service of the …