You know how pirates, pirate-ninjas, pirate-doctors, and certain characters from Street Fighter enjoy wearing an eyepatch? During our younger days, we were brought to believe that it was because they somehow sustained some form of damage in one eye. Or, perhaps, they were suffering from lazy-eye. Sometime recently, Mythbusters kindly demonstrated that wearing an eyepatch for extended periods of time could enhance a person's ability to see in the dark.
I would say that happens because having one eye continually in darkness tricks the brain into making your eyes produce more visual purple, the pigment that helps you see in low-light conditions.
While we're at it, think of the number of characters and personalities we know that only see through one eye. There's Leela from Futurama, who only has one eye. There's that weird tentacle beast from the trash compactor in Star Wars.
We all (probably) know that stereoscopic vision(the ability to see in three dimensions) is only possible if we have more than one eye angled in a slightly different position. Only then, can our brain interpret the two (or more) images to produce a three-dimensional image.
So. The question now is, how do pirates aim? How do they even pour themselves a cup of tea? Wouldn't their complete lack of proper depth perception basically give them the visual prowess of half a cow? And wouldn't this, naturally, make it pretty impossible for them to fight anything that knows how to step backwards every so often?
On a side note, I've been watching The Big Bang Theory. It really is very entertaining.
On an even sidier note, happy National Day.
Inside each of those missiles. there is candy! And patriotism, of course.
-Joe