the blind spot can be trained to shrink 10%:-http://www.nytimes.com/2015/09/01/science/blind-spot-can-be-trained-away-a-study-says.html?emc=edit_th_20150901&nl=todaysheadlines&nlid=60788861&_r=0-"The optic nerve, which carries visual signals to the brain, passes through the retina, a light-sensitive layer of tissue. There are no so-called photoreceptors at the point where the optic nerve intersects the retina. The right eye generally compensates for the left eye's blind spot and vice versa, so the spot is hardly noticed.-"Researchers trained 10 people using a computer monitor and an eye patch. The participants were shown a waveform in the visual field of their blind spot day after day. After 20 days of this repeated stimulation, the blind spot shrunk by about 10 percent.-"The researchers believe that neurons at the periphery of the blind spot became more responsive, effectively reducing the extent of functional blindness."