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Home » Eye Care Services » Your Eye Health » Contact Lenses » Gas Permeable (GP) Contact Lenses

Gas Permeable (GP) Contact Lenses

Advantages of gas permeable lenses

  • GP lenses allow your eyes to “breathe” better. GP lenses allow more oxygen to reach the front surface of the eye. This reduces the risk of eye problems caused by hypoxia (reduced oxygen supply). Gas permeable lenses provide a better oxygen supply than most soft lenses because:
    • The silicone-containing lens materials of GP lenses are more permeable to oxygen than many soft lens materials (though new “silicone hydrogel” soft lenses are comparable to GPs in oxygen transmission).
    • GP lenses are smaller in diameter than soft lenses, so they cover up less of the front surface of the eye (the cornea).
    • Gas permeable lenses hold their shape and move on the eye with each blink. This movement pumps oxygen-containing tears under the lens. Soft lenses conform to the shape of the cornea and have only minimal movement with blinks, so little or no tears circulate under soft lenses.
  • GP lenses provide sharper vision. Because they are custom-machined to a smooth surface and maintain their shape on the eye, GP lenses provide sharper vision than soft lenses, which can fluctuate in shape and clarity if they start to dry out. Gas permeable lenses also provide a more stable and accurate correction of astigmatism.
  • GP lenses last longer. GP lenses are rigid, so there’s no worry about ripping or tearing them. They are also easier to keep clean and don’t need to be replaced frequently like soft lenses. With proper care, a single pair of GP lenses can last a year or longer. And since they’re long-lasting, GP can be less expensive than soft lenses in the long run.
  • GP lenses may slow the progression of nearsightedness. In addition to their other advantages, some research suggests that wearing gas permeable lenses may slow the progression of myopia (nearsightedness) in some children. GPs are also used for orthokeratology, where specially designed contacts are worn during sleep to reshape the cornea and improve vision.

The downside of GP contact lenses

So why doesn’t everyone wear GP lenses? Potential disadvantages of GP lenses (compared to soft lenses) include:

  • Need for adaptation. Unlike wearing soft lenses (which are comfortable right from the start), you may need few weeks before you can wear GP lenses comfortably all day. Initially, you may be able to wear the lenses only a few hours daily until your corneas adapt to them. But if you can tough it out for those first few days, you may be pleasantly surprised at how comfortable GP lenses become. Many people who switch from soft lenses to gas permeable lenses say GP lenses are more comfortable than soft lenses (after their eyes fully adapt) and their vision is noticeably clearer.
  • Inability to wear part-time. To fully adapt to GP lenses and to stay comfortable wearing them, you have to wear them every day. If you stop wearing them for several days, you will be more aware of the lenses on your eyes and you’ll have to re-adapt to the lenses.
  • Increased possibility of dislodging. Because they are smaller than soft lenses, gas permeable lenses can dislodge from your eyes during contact sports or if you rub your eyes aggressively.
  • Vulnerability to sand and dust. GP lenses don’t conform to the shape of your eye like soft lenses do, so it’s possible sand or dust can get under your lenses at the beach or on a windy day. (You can minimize this risk by wearing wrap-style sunglasses outdoors.)
  • Higher lens replacement costs. Unlike soft lenses, which come in limited sizes, GP lenses are custom-made to the shape of your eye. This makes GP lenses more expensive to replace if you lose them. Also, it can take up to a week to get a GP lens replaced.So it’s a good idea to purchase a spare pair to avoid the inconvenience of being without your GP lenses if you lose or break one.

Best of both worlds?

Since comfort is the primary barrier to GP use, an interesting innovation is the hybrid contact lens. These lenses have a GP center, surrounded by a soft lens “skirt.” The goal of hybrid lenses is to provide the clarity of a gas permeable lens and wearing comfort that rivals that of a soft lens.

Call for more information and a trial fitting

To see if gas permeable lenses are right for you, call our office for more information and to schedule a trial fitting.

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Our office will be opening on Monday, May 18th. We will be following all CDC guidelines as well as those recommended by our National and State Organizations including the KOA and AOA as well as the Governor of Kentucky. We will be adding to our protocol to ensure the safety of our patients and staff. Due to the recommendations, we are following, all patients will need to call from the parking lot when they arrive. We will ask you if you are running a fever, or have symptoms of COVID-19. We may even take your temperature to keep for our records. We will ask that you remain in your car until we notify you to come to our office.

All patients entering the building must wear a mask or face covering.

We ask for your patience over the next few months as we work to get our patients rescheduled that had to be canceled during the closure. We will not be working at full capacity for some time and realize this will most likely cause delays in getting people rescheduled. We will also not be taking walk-in patients and ask that you please call if you need to be seen to set up an appointment. Please know that we are doing everything we can to take care of our patients during these difficult times.

You now can order contacts from the convenience of your home on our website by clicking here.
If you do not know your current prescription, please email us at dr.glenn0180@gmail.com or call us at 859-271-6194.
If you have insurance you would like to use, you will need to call us and we will be happy to place the order for you and submit it to your insurance.

Thank you and we look forward to seeing you all soon,

Dr. Jason Glenn and Staff