The proper role of government in a capitalist economic system has been hotly debated for centuries. Unlike socialism, communism or fascism, capitalism does not assume a role for a coercive, centralized public authority.
Reading glasses come in two main styles: full frames, in which the entire lens is made in the reading prescription, and half-eyes, the smaller Ben Franklin style glasses that sit lower down on the nose. Full reading glasses are suitable for people who spend a great deal of time concentrating on material close-up. If you try to look up and across the room through the reading lenses, everything appears blurry.
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.