pinguecula
• It is the most common conjunctival degeneration.
• It is a harmless gray-yellow thickening of the epithelium in the nasal part of the bulbar conjunctiva, often in the lid space (hyaline degeneration).
• Its prevalence is high in Gaucher disease.
pterygium
• It is the conjunctival fold that extends over the cornea from the nasal side of the bulbar conjunctiva.
• Yellow-green half-moon shaped iron deposition at the level of Bowman's membrane adjacent to the head, advancing to the cornea, is called Stocker's line.