Can contact lenses damage your eyes?
Contact lenses are very safe. Still, wearing contact lenses can damage your eyes if you wear them too long, fail to clean them properly or do not replace them as directed by your eye care professional.
Contact lenses are considered medical devices in the UK, EU, United States and much of the world. This is because the lenses are a form of vision correction that directly touches the eye.
While it is possible to get contacts in some countries without a contact lens prescription, it's not a good idea. You should always visit an eye care professional to get contact lenses to ensure they fit properly and have been manufactured safely.
Keep the oxygen flowing to your eyes
Because contact lenses rest directly on the eye and cover the entire cornea (or, in the case of gas permeable contact lenses, part of the cornea), they decrease the amount of oxygen that reaches your eyes from the environment. A good oxygen supply is essential to keeping your eyes healthy.
You can limit the potentially harmful effects of oxygen deprivation from contact lens wear by doing the following:
Adhere to the wearing schedule your eye care professional recommends; discard and replace your contacts as directed.
You also may want to choose modern silicone hydrogel contact lenses. These soft lenses are made of a material that transmits more oxygen than conventional soft contact lens materials and may be safer for your eyes in the long run.
Another option is rigid gas permeable (GP) contact lenses. Gas permeable contacts are smaller in diameter than soft or silicone hydrogel lenses and therefore cover less of the cornea. Also, GP contacts move a significant amount with each blink, allowing fresh tears to move under the lenses. These two factors decrease the risk of eye problems with gas permeable lenses, compared with wearing soft contacts.
Clean your contact lenses and case
Contact lenses also increase the risk of eye damage because bacteria and other infection-causing agents can accumulate on them. This is especially true as the lenses get older and deposits accumulate on the front and back surfaces of the lenses.
According to the Brien Holden Vision Institute, eye infections occur only in about 4 of every 10,000 daily contact lens wearers (0.04%) and 20 of every 10,000 people who wear extended wear contact lenses on an overnight basis (0.2%), but the effects can be devastating.*
You can significantly reduce the risk of contact lens-related eye infections by properly cleaning and disinfecting your contacts after each use. Use only the contact lens solutions your eye care professional recommends, and don't change brands without first consulting with your eye care professional.
Also, though most contact lens wearers use "no-rub" contact lens solutions, recent studies show these products clean your lenses significantly better if you rub your lenses while rinsing them with the solution (these one-step products are also called "multipurpose solutions," because they contain ingredients that both clean and disinfect contact lenses.)
It's also very important to rinse your lens storage case with fresh contact lens solution and let it air dry while you are wearing your contacts. This reduces the risk of the case getting contaminated with microorganisms that can damage your eyes. You also should discard and replace your storage case at least every three months.
Also, use fresh multipurpose solution each time you store your lenses. Do not simply "top off" solution you've left in the case from the previous day. Doing so decreases the effectiveness of the solution, possibly leading to lens contamination and a serious eye infection.
Follow your contact lens replacement schedule
Avoid over-wearing your contact lenses and be sure to discard and replace them as directed by your eye care professional.
Even if you care for your lenses as directed, lens deposits continue to build up on your contacts over time. The longer you go before replacing your lenses, the greater potential these lens deposits have to reduce the oxygen supply to your corneas and damage your eyes.
Finally, be sure to see your eye care professional as directed for routine contact lens eye exams. Your eye care professional can detect small problems before they become big ones, and help you keep your eyes safe and healthy while you wear contact lenses.
*Antimicrobials target contact lens cases to reduce infection. Brien Holden Vision Institute. Media release issued in July 2011. (BHVI is affiliated with the School of Optometry and Vision Science at the University of New South Wales in Sydney, Australia.)
Page published in March 2022
Page updated in March 2022