Ocular surface
A pterygium is a small veil of conjunctiva (the thin membrane of the white of the eye) that thickens and advances, in a triangle, towards the cornea — most often on the side of the nose. Promoted by sun, wind and dust. Drag to see how it progresses:
Eye seen from the front
Vision (optical axis)
Educational diagram — Dr Moïse Tourabaly, ophthalmologist. For information only; it does not replace an examination.