Stop. Stop NOW and look up the definition of Science.
Done it yet? Good.
Opinions count about as much as a rat's arse when it comes to reaching scientific conclusions. A little less, actually, because a rat's arse can be used to acquire data sets under the proper condition. If you truly, honestly give half a damn about human visual capabilities, why don't you read up on some actual studies that have undergone the scientific method and have been tested for rigor - or better yet, conduct the experiments yourself while maintaining an unprejudiced position. What you should never do is make meaningless postulations based upon internet hearsay and rumor mongering - that helps no one.
People like you are the type of people who wanted to burn Galileo at the stake. People like you are the type of people who un-questioningly stood by the Catholic Church during the reformation period. People like you have probably never conducted any research of your own into anything, content to blindly spout off the information other people give you regardless of it's accuracy. People like you, piss me off.
You remind me of an Economics/Ethics Class I took in college, during one of our postulation days. One of my classmates posed the "Human's only use X% of the brain" myth - which I opposed. Unfortunately, the teacher took her side of it, and the rest of the class soon followed. It took me a half an hour of showing them study after study proving that they were wrong; and it only took that long because of the mentality that you and so many others on this board right now are sharing, that majority opinion made scientific fact.
They figured, if so many of us believe it, it has to be true. Please, anyone here who is sharing this mentality concerning any matter of Scientific Theory - physical, biological or chemical - kindly get the hell off my interwebs, you pseudo-intellectual pollutants.
TL;DR -
Science. It works, bitches. Shut the
@#$% up if you don't have rigor to back up your drivel.
((ANGRY NERD IS ANGRY. RAWR.))