A pterygium is a non-cancerous growth of the conjunctiva, which lays over the sclera. In most cases, a pterygium grows from the inner corner of the eye. A pterygium is usually painless, though it can cause irritation to the eye at any stage. The tissue is often triangular, pink and fleshy. Fine blood vessels may be visible.
Acute Angle Closure Glaucoma: External Appearance. Blockage of the drainage angle causes IOP to rise. High pressure results in a constellation of signs seen in acute angle closure glaucoma including redness of conjunctiva (red arrow), haziness of the cornea, and a mid-dilated pupil (white arrow).
Circumferential retinal folds in peripapillary region due to papilledema. The main cause of optic nerve head swelling is blockage of the axoplasma transport and the blockage occurs at the lamina cribrosa. The optic nerve head can swell to the extent where it is extended forward into the vitreous as well as laterally. This lateral swelling causes the retina to buckle inward at the temporal aspect of the optic nerve head. The buckling is know as Paton's lines or folds.