Contact Lenses
Member Service Desk
Login   Re-Order   Track Order   Logout
US CurrencyCanadian Currency
  Home  | Corporate Info | How to Order | Worldwide Shipping | Contact Us | View Cart
 MOST POPULAR [A-Z]
  Cosmetic Lenses
  Cosmetic 2 Tone
  Cosmetic Pure Tone
  Cosmetic lenses with Rx
  Special Effect Lenses
  Big Eye
  Golden Eye
  Rx Lenses (box)
  Accessories
 CONTACTS KNOW HOW
  Color Guide
  Eye Care
  Wearing Tips
  Contacts Fitting
  Prescriptions
  Contacts Category
  Contacts Type
  Contacts Materials

Tell a friend about our contacts store

Contact Lens Materials

Up until the late 1970s, contact lenses were made from two materials. Hard contact lenses were made of polymethymethacrylate (PMMA), while the soft contact lenses were made of a hydrated polymer, hydroxyethylmethacrylate (HEMA), which contained 37.8% water by weight. These lenses provided clear vision and comfort, but there was a problem. These lenses did not allow oxygen to reach the cornea. Because of this, the cornea could change, adversely, in some contact lens wearers.

PMMA is now obsolete, and is replaced with rigid plastics, mostly hydrophobic materials with high oxygen permeability. These lenses are called Rigid Gas Permeable (RGP) lenses. For the manufacture of soft lenses, HEMA is being replaced by polymers which contain as much as 80% water. These soft lenses, often called hydrogels because of the amount of water have high oxygen transfer while retaining shape despite high water content. These new materials used in the manufacture of contact lenses as well as thinner lenses and greater oxygen transfer has reduced corneal issues, but there are still other possible complications.

The new materials have also been instrumental in the creation of disposable  contact lenses in a variety of types. Disposable contact lenses come in monthly, bi-monthly, weekly, and even daily disposable types. The thinner materials make wearing these contact lenses more comfortable, and the cost of contact lenses has been reduced. This allows for close to maintenance free contact lens wear.

Back to Top

Home | Corporate Info | How to Order | Contact Us | Site Map | View Cart
The information contained on this site is general in nature and is not meant to substitute for the advice provided by your contact lenses physician or other professional. None of the statements on this site are suggesting, or in preference to a particular contact lenses, nor must they be considered as medical advice. If you are doubt about a disease or health related condition of any kind, please contact your health care professional immediately.
Please see our service Terms and Conditions for more information.

Home | Corporate Info | How to Order | Contact Us  | Useful Info | Site Map
Last updated June 18, 2004
1800Color (c)All Rights Reserved