Vision, loss of
The incapacity to see. Loss of vision can develop slowly or very rapidly, and it can be permanent or temporary, depending on the cause. Loss of vision can affect both or one eye. It may cause complete blindness or may only affect the central or peripheral vision.
Slow vision loss
Progressive loss of visual clarity is widespread with increasing age and can be caused by any number of disorders.
Sudden vision loss
Sudden loss of vision can be caused by disorders such as hyphaema (bleeding into the aqueos humour), extreme uveitis (inflammation of the choroid or iris), vitreous haemorrhage (bleeding into the gel within the eye), or retinal haemorrhage. Optic neuritis (inflammation of the optic nerve) can reduce vision in one eye.
Damage to the nerve connections between the brain and eyes, or to the visual area of the brain, can cause loss of peripheral vision. This nerve damage can be caused by a number of disorders such as embolisms, tumour, inflammation, ischaemia, or injury.