the original hypothesis was not a tenable one as the rabbit with hereditary buphthalmus readily converted beta carotene to vitamin a , no bony changes in the optic foramen were observed with manifest buphthalmus , high levels of beta carotene or vitamin a were unable to block the clinical development of buphthalmia , and no correlation was observed between intraocular pressure and serum vitamin a levels in rabbits fed either beta carotene or pure vitamin a .
C1874541
beta carotene
C0042839
vitamin a