What is a blind spot, and does everyone have one?
A blind spot, or scotoma, is a small area where no vision is present. One of these occurs naturally because the light-sensitive layer - the retina - lining the back of the eye is not continuous. There is a gap in the retina where the optic nerve, which takes the visual information to the brain, leaves the eye. We are not normally aware of this blind spot because the brain 'ignores' the small patch of missing information and 'fills in' our view. In some eye diseases, the retina is damaged and new ‘holes’ appear within the field of vision, but these may not at first be noticed. After a certain amount of damage, the brain is unable to compensate for the lack of information and a person will then become aware of a gap in their vision.
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