Glaucoma is a chronic, progressive eye disease caused by damage to the optic nerve, which leads to visual field loss. Eye pressure is a major risk factor, such that if the eye’s drainage system causes fluid build-up, it results in excess pressure that damages the optic nerve, which leads to loss of eyesight.
Once vision loss begins at the edges of a person’s visual field it slowly affects a person’s central vision. However, it can take months to years after nerve damage has occurred before symptoms appear, and once vision is lost, it cannot be recovered.
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