How and why blindness occurs Anything that blocks the passage of light from the outside to the back of the eye, or interrupts the transmission of the nerve impulse from the back of the eye to the brain, will interfere with vision. In the United States, blindness is legally defined as visual acuity of 10% or worse in the eye with greater acuity, even after correction with glasses or contact lenses, or a visual field restricted to less than 20º in the eye with better acuity.
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