In my tutorial I was told to look at optical illusions. This test proves that there is a blindspot in each eye. It is located at the back of the eye, on the retina where the optic nerve joins in. (optic nerve= extension of the brain).
cover left eye. look at the circle. the cross will disappear if you get closer. Thats where the blindspot is. When both eyes are open you wouldn't notice it, as your brain constantly makes assumptions for this area.
I looked at more optical illusions, but I didn't like them or think they would help with my work any further!
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