Alkaptonuria is a rare inborn error of metabolism with autosomal recessive inheritance with a mutation in homogentisate 1. 2-dioxygenase. It results in accumulation of homogentisic acid in connective tissues (ochronosis). Most common ocular manifestations are bluish-black discoloration of the conjunctiva. https://www.soiebiologique.com/limited-price-Test-Evaluation-Command-ACU-Patch-Foliage-Green-flash-choice/