a condition in which there is a build-up of fluid in the eye, which presses on the retina and the optic nerve. the retina is the layer of nerve tissue inside the eye that senses light and sends images along the optic nerve to the brain. glaucoma can damage the optic nerve and cause loss of vision or blindness.
出典:Wikipedia
出典:『Wikipedia』 (2011/07/17 00:05 UTC 版)
Glaucoma is an eye disorder in which the optic nerve suffers damage, permanently damaging vision in the affected eye(s) and progressing to complete blindness if untreated. It is often, but not always, associated with increased pressure of the fluid in the eye (aqueous humour). The term 'ocular hypertension' is used for cases having constantly raised intraocular pressure (IOP) without any associated optic nerve damage. Conversely, the term 'normal' or 'low tension glaucoma' is suggested for the typical visual field defects when associated with a normal or low IOP.