The relation of vitamin A to dystrophies of the posterior segment.
D000368:Aged; D002338:Carotenoids / Q000097:blood*; D006801:Humans; D008875:Middle Aged; D012174:Retinitis Pigmentosa / Q000097:blood*; D014801:Vitamin A / Q000097:blood* / Q000378:metabolism / Q000627:therapeutic use
D014801:Vitamin A; D002338:Carotenoids