When a contact lens wearer is having problems, the complaint often is: "My contacts make my eyes feel dry." Fortunately, there are several remedies.
Dryness is common in contact lens wearers and non-wearers alike. (If you don't wear contacts, you can read about dryness-relieving strategies in our article on dry eye syndrome.)
Thankfully, if you suffer from dry eye symptoms when wearing contacts, today there are many lens care products and new types of lenses available, and the right combination of these products often can improve the comfort of wearing contacts.
While "contact lenses for dry eyes" is not really a particular type of lens, certain lenses may relieve your dryness. Supplementing your contact lens wear with lubricating eye drops approved for use with contacts also can help. The contact lens cleaning and disinfecting products you use also should be evaluated, as different products may work better to keep your contacts moist and comfortable.
Fixing the problem starts with a visit to your eye care practitioner (ECP) so he or she can evaluate the cause of your contact lens-related dry eye symptoms and determine the best solution to increase your wearing comfort. Sometimes contact lens wearers avoid talking to their eye doctor about discomfort for fear that they'll be told they can't wear contacts any longer. But with today's variety of contact lens products, the need to discontinue contact lens wear altogether is very unlikely.
Water Content of Contact Lenses
Soft contact lenses are made of a combination of hydrophilic ("water-loving") polymers that hold water to keep the lenses moist and comfortable. The percentage of water content in soft contacts can vary widely — from about 38 to 79 percent.
Intuitively, you might think that if your eyes are dry you need a higher-water-content lens, but in fact the opposite may be true. The best contact lenses for dry eyes can be lower-water-content lenses. A high-water-content lens may lose much of its moisture more easily due to environmental influences.
Also, if your eyes are inherently dry and you wear high-water lenses, the lenses may be drawing tears away from your eyes to stay properly hydrated, thereby increasing your eye dryness. If this is the case, your eye doctor may switch you to a contact lens with a lower water content.
Silicone Hydrogel Contact Lenses for Dry Eyes
Silicone hydrogel contact lenses are a relatively new class of contact lens materials with high oxygen permeability — a characteristic that's good for your cornea, which needs high levels of oxygen to maintain eye health and good vision.
Silicone hydrogels generally are lower in water content than traditional soft lenses, so they can be good contact lenses for dry eyes. If you are experiencing dryness with standard soft contact lenses, especially toward the end of the day, your eye doctor may recommend switching to silicone hydrogel lenses.
Lens Brands That Solve Dryness Problems
Some brands have been found to be particularly useful contact lenses for dry eyes. Proclear lenses (CooperVision, Inc.), for example, are the only contact lenses on the market to carry the FDA-approved labeling statement, "May provide improved comfort for contact lens wearers who experience mild discomfort or symptoms relating to dryness during lens wear."
Extreme H2O (Hydrogel Vision Corp.) is another brand of soft lenses than many ECPs report to be useful in solving dryness-related comfort issues.
Orthokeratology and CRT
Here's a slightly different approach to contact lenses for dry eyes: Don't wear contacts while you're awake.
Dry eye is a common cause of contact lens discomfort. Special contacts for dry eyes can help. Or you could try ortho-k, which involves wearing contacts at night; they reshape your eyes gradually so you can see during the day without any contacts at all.
Orthokeratology (or ortho-k) and corneal refractive therapy (CRT) involve wearing special gas permeable contact lenses that re-shape your cornea to correct nearsightedness and allow you to see clearly during the day without glasses or contact lenses.
The lenses are worn only at night and must be worn just about every night in order to retain your cornea's new shape.
By negating your need to wear contact lenses during the day, ortho-k or CRT may eliminate contact lens-related dry eyes. This is because most people who wear contacts choose soft lenses, which must stay well-moistened to remain comfortable.
If your tear glands don't produce adequate tears to keep them hydrated, soft contacts can dry out and start absorbing moisture from the surface of your eyes, worsening dry eye discomfort. This can be especially troublesome during computer work, which causes people to blink less frequently, and this causes soft contacts to dry out more easily.
Ortho-k and CRT lenses, on the other hand, are gas permeable contacts that require less moisture to stay comfortable. Also, since your eyes are closed during sleep, there is less risk of the lenses and your eyes drying out from tear evaporation.
Cleaning and Disinfecting Products
Not all contact lens cleaning, disinfecting and storage products — collectively called "contact lens solutions" — work well with all contact lenses. In particular, some newer silicone hydrogel contacts have been found less comfortable when used with certain commonly available solutions.
Your ECP probably gave you a sample of a compatible lens care product during your contact lens exam and fitting. But if you switched brands later on, you may have started trouble. And if you switched a store brand of contact lens solution, you may believe you bought a generic form of the product you were already using, but in reality you could be using a completely different product. [Read more about store brands.]
Talk to your ECP about which solutions you're using, and bring the bottles to your visit.
Preservative Intolerance
Another issue with contact lens solutions, even if you're using the correct products, involves multipurpose solutions. While these single-solution products are very convenient, compared with the "old days" when lens cleaners, disinfectants and storage solutions were in separate bottles, multipurpose solutions contain preservatives that occasionally can cause problems.
Some contact lens wearers can develop intolerance to the preservatives in multipurpose solutions, which can manifest itself as dryness. If your eye doctor suspects you are sensitive to preservatives in multipurpose solutions, he or she may recommend switching to a preservative-free, hydrogen peroxide-based lens care system.
Another option is to wear daily disposable contacts that require no care products at all.
Eye Drops
Sometimes contact lens-related dry eyes can be solved with occasional use eye drops known as comfort drops, rewetting drops or artificial tears.
Though these lubricating eye drops typically provide only short-term relief of contact lens dryness symptoms, new drops have been introduced recently and these new products may provide more convenient, longer-lasting relief of dry eye symptoms.
If eye drops are your preferred approach, it's very important to make a product choice in consultation with your eye doctor. Many over-the-counter eye drops are not intended for use with contact lenses, and not all lens-compatible drops are compatible with all lens materials.
Your eye doctor can also tell you about other remedies for contact lens-related dry eyes, including eye vitamins and prescription eye drops for dry eye relief.
credits to:
No comments:
Post a Comment