<unk> , optic nerve<unk> , or optic disc<unk>  (ODP) is rare a congenital excavation (or regional depression) of the optic disc (also optic nerve head), resulting from a malformation during development of the eye. The incidence of ODP is 1 in 10,000 people with no predilection for either gender. There is currently no known risk factors for their development.<unk> s are important because they are associated with posterior vitreous detachments (PVD) and even serous retinal detachments.
Optic pit
Optic cup 
Optic recess
Optic stalk
Optic vesicle
Scleral lens
Lacrimal groove
Corneal button