Four Eyes? You’re not doing it right

May I raise a question. It’s a pretty simple one. It’s one that’s been bothering me for a while. And here it is. Why would you give a alien creature your making four eyes?

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Here’s an image of an alien from the game Mass Effect. I love you Bio Ware but I have no idea how giving anything, four eyes like this would make any sense? …Maybe this isn’t a simple question. Here, let me nit pick this for you.
Humans have binocular vision, meaning we have two eye that are use together as a pear. This allows us humans to track one thing at a time and have pretty good depth perception and such. It looks something like this

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Simple right? Okay so now someone could argue: well if you have four eyes, it could allow you to track two things at once. And yes, that is most likely true. But if that’s so, why hasn’t nature taken advantage of that? Out of the many many animals,  only one  creature has more then  two eyes, the arachnids.

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That’s right! Spiders! (I hate spiders…-shutters-) But why do these little creeps have so many. Well—did you know that spider’s can’t turn their heads? (Except for jumping spider’s. But they’re just weird.) No I didn’t, you say. Well now you do. Notice where these spider’s eyes are? No? Let me show you a better picture.
tumblr_nvly47xadI1tv18aqo1_500.jpgNotice a trend? Most of these little eight eyed freaks have at least two pares of their eyes located on the side of their head. This leads me to the conclusion that the little spider needs those eyes of theirs to compensate for the inability to move it’s head and look  around and track, like most living things with eyes can. 2237688.png
This love picture proves my theory.

So there’s one good reason not to randomly slap on another set of eyes. If your alien or whatever creature your make, can move it’s head to pin point a sound and focus on it, then it probably doesn’t need another pair of forward facing eyes. It’s redundant.
That also brings my attention to another point. Let’s say  you argue that  your creature cant’t move it’s eyes instead. So to make up for that, it has extra eyes. Well here’s where I kill your idea with—

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