The topics are dealt in brief. For detailed information use search engines typing in the names of the conditions as they appear. May be noticed by chance while looking in the mirror or by someone else.
Pterygium is a wing-like fibrovascular membrane usually on the side of the cornea towards the nose.
It has a tendency to progress towards the cornea, when it does so vision is affected due to the irregular astigmatism it produces initially, and later due to the membrane itself, since the later is not transparent. Pingueculum is a white or yellow-white raised nodule on the conjunctiva usually towards the nose and near the cornea. This does not involve the cornea. Etiology Degeneration of deep conjunctiva. Usually associated with outdoors, sunlight, dry arid climates, dust and chronic irritation.