Like staring at your own hand and the background is blurry. Why not be able to see everything equally as if we’re looking at it directly?
In: Biology
Your eye has a lens in it. The lens is subject to the laws of optical physics, and that produces an effect called “depth of field”. Since the light sensitive surface of the eye is almost a sphere, the region of space which can be sharply focused is also a sphere – all the points that are the right distance from the eye. The eye’s lens is adjustable with tiny (very strong) muscles, so you can move the distance in and out. The small aperture of the eye (the black pupil) gives more depth of field, so objects that are about the same distance from the eye as the point of focus are also pretty sharp. Objects far from the point of focus, either nearer to the eye or farther from it, are out of focus (blurry).
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