- conjunctival pterygium [DOID:10526]
A pterygium that is characterized by conjunctival degeneration, a fleshy outpouching of conjunctival growth and has_symptom fleshy bumps on the surface of the eye, foreign body sensation, decreased vision, and astigmatism. Conjunctival pterygiums are more common in people prone to ocular surface injury, such as those living in sunny, hot, and dry climates. Conjunctival pterygiums progress from pinguecula.
- progressive peripheral pterygium [DOID:13474]
A conjunctival pterygium that is characterized by progressive (as opposed to quiescent) fleshy outpouching of conjunctival growth and has_symptom fleshy bumps on the surface of the eye, foreign body sensation, decreased vision, and astigmatism. Progressive peripheral pterygiums are more common in people prone to ocular surface injury, such as those living in sunny, hot, and dry climates. Progressive peripheral pterygiums progress from pinguecula.
- central pterygium [DOID:13473]
A progressive peripheral pterygium that is characterized by progressive fleshy outpouching of conjunctival growth that has grown to involve the visual axis and has_symptom fleshy bumps on the surface of the eye, foreign body sensation, decreased vision, and astigmatism. Central pterygiums are more common in people prone to ocular surface injury, such as those living in sunny, hot, and dry climates. Central pterygiums progress from pinguecula.
- double pterygium [DOID:10525]
A pterygium that is characterized by a fleshy outpouching of conjunctival growth that appears to have multiple heads or areas of bulk or origin and has_symptom multiple fleshy bumps on the surface of the eye, foreign body sensation, decreased vision, and astigmatism. Double pterygiums are more common in people prone to ocular surface injury, such as those living in sunny, hot, and dry climates. Double pterygiums progress from pinguecula.