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Archive for December, 2012

Oxygen Permeability of Silicon Hydrogel Contact Lenses

Silicon Hydrogel Contact Lenses   The cornea is the transparent part of the eye that covers the pupil and the iris.  It is a unique part of the human body in that it does not receive its supply of life-giving oxygen from arteries carrying oxygen-enriched blood. Rather, the cornea receives its supply of oxygen directly from the air.

It’s imperative the cornea receive a sufficient amount of daily oxygen to stay healthy. Equally important is the removal of carbon dioxide from the cornea. Unlike other parts of the body where the bloodstream carries away carbon dioxide waste, the carbon dioxide from the cornea is simply diffused into the air.

A contact lens covering the cornea will inhibit the supply of oxygen the cornea receives. If a conventional contact lens remains in the eye for extended periods of time, it will deprive the cornea of sufficient amounts of oxygen and may lead to problems. That’s one of the reasons why it’s so important to remove conventional contact lenses from the eyes daily.

Hypoxia

If the oxygen supply to the cornea is significantly reduced by something like a contact lens, it’s a condition called hypoxia. Hypoxia can lead to a number of eye problems including eye discomfort, blurred vision, red eyes, corneal swelling and eye infections.

Silicone Hydrogel Contact Lenses

contact lensesSilicone hydrogel contact lenses are an alternative to conventional contact lenses. These types of contact lenses allow increased amounts of oxygen to pass through the lens and reach the cornea. In fact, silicone hydrogel contact lenses allow up to five times more oxygen to reach the cornea than conventional contact lenses. This ability gives a person wearing silicone hydrogel contact lenses with more options in terms of how long lenses can stay in the eyes and they are generally more comfortable.

Silicone Hydrogel Contact Lenses for Special Types of Eye Conditions  

The increased oxygen permeability of silicone hydrogel contact lenses also makes them a great fit for contact lens designs for special types of eye conditions including:

  • Toric contact lenses for astigmatism.
  • Bifocal contact lenses.

 Talk to Your Eye Doctor about Silicone Hydrogel Contact Lenses

If you are a contact lens wearer or would like to utilize contact lenses for your vision correction needs, discuss silicone hydrogel contact lenses with your eye doctor. He or she will be able to tell you if they are a good fit for your lifestyle and your vision.

Learn more about quality eye care and eye wear from a company and a team of eye care professionals who have been providing a superior level of service for more than 35 years. Please visit www.shawneeoptical.com.

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