Ocular cystinosis is the benign, adult form of cystinosis, a metabolic disease characterized by an accumulation of cystine crystals in the cornea and conjunctiva responsible for tearing and photophobia and associated with no other additional manifestations. The disease is ocular cystinosis (MONDO_0009064, a Monarch Disease Ontology identifier). Also known as: adult-onset cystinosis, non-nephropathic cystinosis.