<prompt> A condition with collagenous degeneration of conjunctiva and invasion of corneal epithelium followed by destruction of stromal layer and Bowmans membrane: March 2011 March 2013 a, c, f, g,ConjunctivitisTrachomaPingueculaPterygium  <response>: Ans. D: Pterygium A pterygium is a degenerative condition of the subconjunctival tissue which proliferate as vascularized granulation tissue to invade the cornea, destroying the superficial layers of the stroma and Bowmans membrane, the whole being covered by conjunctival epithelium 