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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.

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SaveOnLens are online suppliers of Contact Lenses, we stock a wide range of brands name contact lenses like Johnson and Johnson, Ciba Vision, Bausch and Lomb, Cooper Vision and Boston RGP lenses. To experience a hassle free Contact Lens replacement service, simply place your order with us today and you can reorder your Contact Lenses Online at a click of a button.

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. 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. If you are doubt about a health related condition of any kind, please contact your health care professional immediately. Please see our service Terms and Conditions for more information.

saveonlens.com offers a full range of products including disposable, colored, bifocal, soft contact lenses and RGP.  There are great benefits when you order contact lenses online.  Since there is less overhead, the savings are passed on to you by offering discount contact lenses. Order discount contact lenses online for all your discount contact lenses and accessories. Please bookmark us at www.saveonlens.com.

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