Proclear are the first soft monthly contact lenses in the world with "phosphorylcholine", a natural substance. It is used in medicine (artificial arteries, etc.) because of its absolute tissue compatibility. Proclear contact lenses are considered by the eye as a natural substance. The lenses remain evenly moist throughout the day until late at night, there is practically no feeling of dryness on the eye. Proclear are particularly suitable for VDU work. Due to the electrical neutrality, the surface of the Proclear contact lens does not tend to form deposits, e.g. lipids and proteins from the tear film.