That does not imply that evolution has not tried. Human ancestors had much shorter life span and even millions of years can be not enough to fully adapt the vis

That does not imply that evolution has not tried. Human ancestors had much shorter life span and even millions of years can be not enough to fully adapt the vision for a longer lifespan especially when things works good enough. Witness flatfish. We have good records for species to see that it took tenths of millions years for eyes to move 90 degrees on the head after fish ancestors decided to lay flat on the side on ocean floor. It was good enough for the fish to see with single eye most of the time and evolution had little room for improvements since any wrong move with change in vision implied no vision and death.