3-Sudden poor vision
Many people experience age-related decline in eye performance. They find themselves reading books or newspapers closer and closer or farther away to see the letters, eventually requiring reading glasses. These gradual changes in vision usually occur over a period of months or years and are regarded as normal.
But sudden changes in vision are a different story. If your vision suddenly worsens dramatically, it may signify serious health conditions. Multiple sclerosis (MS) (an immune disorder often associated with inflammation along the optic nerve connecting the eyes to the brain) can lead to sudden, blurry sight or loss of color vision. Brain tumors that put excess pressure on the optic nerve can also make vision suddenly poor.
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