several reports have appeared on the efficacy of topically applied 0.01 % or 0.1 % all-trans retinoic acid ( 0.04-0.4 millimolar ) for treatment of xerophthalmia , conjunctival squamous metaplasia , and corneal epithelial erosions in humans and animals .
C0043349
xerophthalmia
C0009758
squamous metaplasia