Conjunctival mucosal overgrowth over cornea -
Pterygium is a non-cancerous (non-neoplasic) growth of conjunctiva, characterized by a wing-shaped fold of conjunctiva encroaching upon the cornea form either side within the interpalpebral fissure. Reference: AK khurana 7th edition page 89
Pterygium
Pingecula
Vernal keratoconjuncivitis
Herbe's pit
Conjunctiva