All right, now first let’s go a little more in-depth into what the eye is made of. The retina is a sheet of receptors at the back of the eye and is made up from two types of photoreceptor cells; rods and cones.
Rods detect light levels, which means they only pick up black and white images. In humans, these are more common near the edge of the eye. Now, there is only a limited number of space for rods and cones in the retina, so if you increase the count of one you have to decrease the count of the other.
Essentially, you must trade color perception for more detailed perception in black and white, which is largely what enables us to perceive motion.
Sasuke using it's sharingan
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