"The eye sees only what the mind is prepared to comprehend". ... Do you think this is true? ... Or untrue?

Not really
Hence feelings like shock, confusion, denial, surprise
We are a lot of what we don't want to see
What the brain and eyes do us to make sense of whats seen
Hence too differing explanations

Largely true. You make sense of something according to your experience of it, or IQ, or imagination. If you can't relate to it how can it have meaning?

Sometimes. Other times, people can see things which shock them into comprehension.

Makes sense to me. As does "Life means what you want it to mean."

true for my mom's generation. not mine.

True a mind is very powerful

OMG YES! Most certainly true

That's fairly certain

In many cases yes.