The visual system has a lot to teach us about mental perceptions. These "eye openers" have some far reaching implications.
One that is commonly described involves the "blind spot" that exists where the optic nerve meets the body of the eye. You are blind at a point in your visual field (lower lateral / far periphery) which is seldom, if ever noticed because your mind completes the perception of having a seamless visual field. Resources may include memory, beliefs, patterns and expectation.
Astigmatism- results in distorted images projected onto the retina. However, an effected person adapts, perceiving shape and position with accuracy, but with less acuity.
We all fill in the blanks. every persons life is a series of seeminly finished puzzles which is amazing becuase these puzzles have a lot of missing pieces.
Vision, like other individual or collective experience is a phenomena that occurs in the mind.
I think I did know about the "visual blind spot" and that our brains filled in the gaps. It is pretty interesting the things the human brain is capable of.