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Understanding the eye: It’s all about light
It all comes down to light. When you look at something — your best friend, or a dog on the street, or a flowerbed — light, in the form of rays, bounces off of that object and passes through your eye’s cornea. Then, it will pass through the iris and lens and – if you’re lucky – comes to a focus on the retina. From there the image gets passed to the optic nerve in the form of electrical impulses, and voilà: you see the object in front of you.