Contact lens are a popular choice for those that wear glasses but like to play sports or prefer the look of not having to wear glasses. They are increasing in popularity and stores are popping online like Clearly Contacts, which sell them at extremely cheap prices, especially when they offer a Cleary Contacts coupon.
The way that they are produced is dependent on the type of contact lens.
Soft contact lenses are made from plastic hydrophilic polymers call hydrogels. These polymers have a property which make them absorb water. By absorbing water, the lenses become soft and pliable. They are made by either a lathe cutting process or by a method of injection moulding.
If they are made by lathe cutting, then the contact lens material is placed onto a computer powered lathe which shapes them as required. If they are made with an injection mould, then the plastic is heated up to a temperature and then placed into a mould.