The blind spot is caused by:
the absence of rods or cones at the point where the optic nerve leaves the eye
The blind spot is caused by the optic nerve that exits the back of the eye. This area does not have any photoreceptor cells (rods and cones), which are responsible for detecting light and color. As a result, any image that falls on the blind spot is not detected by the retina and is not transmitted to the brain. However, our brain compensates for the blind spot by filling in the missing information with surrounding visual information, so we are usually not aware of it.
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