The histology of pterygium includes -
Pathologically pterygium is a degenerative and hyperplastic condition of conjunctiva. The subconjunctival tissue undergoes elastotic degeneration and proliferates as vascularised granulation tissue under the epithelium, which ultimately encroaches the cornea. The corneal epithelium, Bowman&;s layer and superficial stroma are destroyed. ref: A K KHURANA OPHTALMOLOGY,E4, Page-80
Elastotic degeneration
Epithelial inclusion bodies
Precancerous changes
d) Squamous metaplasia of the epithelium
Conjunctiva