Pterygium is a frequent, degenerative ocular surface lesion, characterized by invasion of the cornea by a fibrovascular tissue originating from the bulbar conjunctiva Chronic papillary conjunctivitis (tarsal conjunctiva ) Numerous goblet cells and papillary folds Chronic inflammatory cells (lymphoid follicles and plasma cells) Isolated islands of epithelium may form retention cysts that calcify Late changes are epithelial atrophy, keratinization and stromal scarring Epibulbar choristoma is a congenital benign tumor, composed of mature tissues of ectodermal and mesodermal origin usually located at the junction between the cornea and conjunctiva Conjunctival intraepithelial neoplasia is a spectrum of abnormal growth of atypical squamous epithelial cells of the conjunctiva ; graded based on thickness of epithelial involvement
