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In the laboratory, the prescription eye glasses start off as lens blanks, which are either made from a plastic or glass disc that is about four inches wide and up to one and one-half inches thick. The blank lens has a flat back surface and a curved front surface.
The lenses in your prescription eyeglasses correct these problems by bending the light before it hits your eye in order to compensate, one way or the other, for your vision problems. It's this bending of the light that allows you to start a fire with your glasses - depending, that is, on what type of glasses you have. The Glasses: There are two main types of corrective lenses: Converging lenses and diverging lenses.