by 
Smurphy
ANSWERS: 4
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Yes I do.
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Yes, if you don't, you should see a doctor.
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There are 2 kinds of light receiving cells in your eye; rods and cones. Cones see color, rods do not. Somewhere near the center of your retina is the "fovea." This is where the light receiving cells of your eye are primarily located, become more sparse with distance from the center. Cones are found in great quantities in the fovea, but are very scarce outside that area, whereas rods are more abundant outside the center. When you see something in your periphery the light from that object hits the SIDES of the retinal area, NOT the fovea, so you do not experience the color spectrum because no cones are present. But there are rods there so you can see that something is there. If it is something that you have already seen, or an object or place that you are familiar with, you already KNOW in your mind what color it is, and so even though you don't ACTUALLY see the color, your mind tells you, "that's a banana, banana's are yellow," and you think you see the yellow, even though technically you COULD NOT have due to your physical limitations.
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Theicidal Maniac (what kind of a nic is that!!??) is right. To test it, take a red felt pen and hold it at arms length behind your field of view (which is surprisingly wide) at eye level. Keep looking dead ahead. Smoothly bring the pen forward into your field of vision. If you don't peek at the pen, you'll notice the movement before the shape, and you'll see the shape as a dark object. It's only as you keep it coming towards the centre of your field of vision that you'll see colour clearly.
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