Very fundamental question and answer could covers pages but here is a very easy and short write up of how does we see.
Our eye is just like a conventional camera that directs light beam into a film. In addition to other parts most important two part of our eye are lens and retina. When light reflects from an object passes through lens and converge on a precise spot on the retina it creates an upturned image of that object. The sensation then carries to brain by optic nerve and we see that definite object clearly.
When light can't converge appropriately or cornea is not in ideal shape so they don’t create a perfect reflection which results to indistinct or distorted picture. That's why we are now start suffering from eyesight trouble.
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