RT Journal Article SR Electronic T1 Ocular manifestations of vitamin A deficiency. JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 854 OP 859 DO 10.1136/bjo.51.12.854 VO 51 IS 12 A1 G Venkataswamy YR 1967 UL http://bjo.bmj.com/content/51/12/854.abstract AB