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Well, the human eye works no less than a digital camera.

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The fact that you are seeing so many things has a process.

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And I'll tell you what actually happens inside your eyes.

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This is the cornea.

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The cornea is the clear front surface of the eye.

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You know, it actually acts like a camera lens.

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You could say that this is the window that allows the light to get in.

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Next comes the iris, which is a thin circular structure in the eye.

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This works like a camera shutter, deciding what should be the amount of light that enters the eye.

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It passes the light rays to the back of the eye called the pupil.

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which appears as a black hole at the centre of the iris.

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It is the opening through which light enters the eye.

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Depending on the amount of light, the iris stretches and contracts the pupil.

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Just how the aperture of a camera works.

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Then comes the lens of the eye, which is just behind the pupil.

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Okay, do this experiment.

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Close one eye and bring a pencil close to the eye which is open.

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Make sure you can see it clearly.

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Now, bring the pencil close to your eye.

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Bring it closer, closer, that's right.

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Now, does it become blurry?

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Well, this is the job of the lens of your eye.

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It focuses and de-focuses, depending on how far the object is from your eye.

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Now, the light reaches the retina.

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This acts as an image sensor of a digital camera.

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Well, in simpler words, it converts the light that you take in, into electronic signals.

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Then, the optic nerve of the eye transmits those electronic signals to the brain..

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..which lets you finally see an object.