The natural shape and curve of your cornea and eye dictates how clearly you see. If they are shaped just right, you will have clear vision at all distances. However, if your cornea is too steep or flat – or your eye is too long or short – you will end up with blurry vision at near, far or all distances. This is because the cornea is not allowing light to properly bend (refract) and focus on the retina (the back of the eye).