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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.
Polycarbonate and Trivex Lenses are both materials for you to choose from when it comes to glasses. Anyone who wears glasses knows the difficulty of certain activities is increased because you must keep your glasses on your face while active.rivex Lenses. Trivex lenses are made from a lightweight, impact-resistant material. It was developed in 2001 by PPG Industries as an alternative to polycarbonate. Trivex lenses are made from a urethane-based monomer.