Dry eye disease is a common condition that occurs when your tears aren't able to provide adequate lubrication for your eyes. Tears can be inadequate and unstable for many reasons. For example, dry eyes may occur if you don't produce enough tears or if you produce poor-quality tears. This tear instability leads to inflammation and damage of the eye's surface.

Dry eyes feel uncomfortable. If you have dry eyes, your eyes may sting or burn. You may experience dry eyes in certain situations, such as on an airplane, in an air-conditioned room, while riding a bike or after looking at a computer screen for a few hours.

Treatments for dry eyes may make you more comfortable. These treatments can include lifestyle changes and eye drops. You'll likely need to take these measures indefinitely to control the symptoms of dry eyes.

Signs and symptoms, which usually affect both eyes, may include:

• A stinging, burning or scratchy sensation in your eyes
• Stringy mucus in or around your eyes
• Sensitivity to light
• Eye redness
• A sensation of having something in your eyes
• Difficulty wearing contact lenses
• Difficulty with nighttime driving
• Watery eyes, which is the body's response to the irritation of dry eyes
• Blurred vision or eye fatigue

See your health care provider if you've had prolonged signs and symptoms of dry eyes, including red, irritated, tired or painful eyes. Your provider can take steps to determine what's bothering your eyes or refer you to a specialist.

Factors that make it more likely that you'll experience dry eyes include:

• Being older than 50. Tear production tends to diminish as you get older. Dry eyes are more common in people over 50.
• Being a woman. A lack of tears is more common in women, especially if they experience hormonal changes due to pregnancy, using birth control pills or menopause.
• Eating a diet that is low in vitamin A, which is found in liver, carrots and broccoli, or low in omega-3 fatty acids, which are found in fish, walnuts and vegetable oils.
• Wearing contact lenses or having a history of refractive surgery.

People who have dry eyes may experience these complications:

• Eye infections. Your tears protect the surface of your eyes from infection. Without adequate tears, you may have an increased risk of eye infection.
• Damage to the surface of your eyes. If left untreated, severe dry eyes may lead to eye inflammation, abrasion of the corneal surface, corneal ulcers and vision loss.
• Decreased quality of life. Dry eyes can make it difficult to perform everyday activities, such as reading.

If you experience dry eyes, pay attention to the situations that are most likely to cause your symptoms. Then find ways to avoid those situations in order to prevent your dry eyes symptoms. For instance:

• Avoid air blowing in your eyes. Don't direct hair dryers, car heaters, air conditioners or fans toward your eyes.
• Add moisture to the air. In winter, a humidifier can add moisture to dry indoor air.
• Consider wearing wraparound sunglasses or other protective eyewear. Safety shields can be added to the tops and sides of eyeglasses to block wind and dry air. Ask about shields where you buy your eyeglasses.
• Take eye breaks during long tasks. If you're reading or doing another task that requires visual concentration, take periodic eye breaks. Close your eyes for a few minutes. Or blink repeatedly for a few seconds to help spread your tears evenly over your eyes.
• Be aware of your environment. The air at high altitudes, in desert areas and in airplanes can be extremely dry. When spending time in such an environment, it may be helpful to frequently close your eyes for a few minutes at a time to minimize evaporation of your tears.
• Position your computer screen below eye level. If your computer screen is above eye level, you'll open your eyes wider to view the screen. Position your computer screen below eye level so that you won't open your eyes as wide. This may help slow the evaporation of your tears between eye blinks.
• Stop smoking and avoid smoke. If you smoke, ask your health care provider for help devising a quit-smoking strategy that's most likely to work for you. If you don't smoke, stay away from people who do. Smoke can worsen dry eyes symptoms.
• Use artificial tears regularly. If you have chronic dry eyes, use eye drops even when your eyes feel fine to keep them well lubricated.

Tests and procedures that may be used to determine the cause of your dry eyes include:

• A comprehensive eye exam. An eye exam that includes a complete history of your overall health and your eye health can help your eye care specialist diagnose the cause of your dry eyes.

• A test to measure the volume of your tears. Your eye care specialist may measure your tear production using the Schirmer tear test. In this test, blotting strips of paper are placed under your lower eyelids. After five minutes your eye care specialist measures the amount of strip soaked by your tears.

  Another option for measuring tear volume is the phenol red thread test. In this test, a thread filled with pH-sensitive dye (tears change the dye color) is placed over the lower eyelid, wetted with tears for 15 seconds and then measured for tear volume.

• A test to determine the quality of your tears. Other tests use special dyes in eye drops to determine the surface condition of your eyes. Your eye care specialist looks for staining patterns on the corneas and measures how long it takes before your tears evaporate.
• A tear osmolarity test. This type of test measures the composition of particles and water in your tears. With dry eye disease, there will be less water in your eyes.
• Tear samples to look for markers of dry eye disease, including elevated matrix metalloproteinase-9 or decreased lactoferrin.

You may be able to manage your dry eyes with frequent eyelid washing and use of nonprescription eye drops or other products that help lubricate your eyes. If your condition is long term (chronic), use eye drops even when your eyes feel fine to keep them well lubricated.

Selecting and using nonprescription products for dry eyes

A variety of nonprescription products for dry eyes are available, including eye drops, also called artificial tears, gels and ointments. Talk with your eye care specialist about which might be best for you.

Artificial tears may be all you need to control mild dry eye symptoms. Some people need to put drops in several times a day, and some use them only once a day.

Consider these factors when selecting a nonprescription product:

• Preservative vs. nonpreservative drops. Preservatives are added to some eye drops to prolong shelf life. You can use eye drops with preservatives up to four times a day. But using the preservative drops more often can cause eye irritation.

  Nonpreservative eye drops come in packages that contain multiple single-use vials. After you use a vial, you throw it away. If you rely on eye drops more than four times a day, nonpreservative drops are safe.

• Drops vs. ointments. Lubricating eye ointments coat your eyes, providing longer lasting relief from dry eyes. But these products are thicker than eye drops and can cloud your vision. For this reason, ointments are best used just before bedtime. Eye drops can be used at any time and won't interfere with your vision.
• Drops that reduce redness. It's best to avoid these as your solution for dry eyes, as prolonged use can cause irritation.

Washing your eyelids to control inflammation

For people with blepharitis and other conditions that cause eyelid inflammation that blocks the flow of oil to the eye, frequent and gentle eyelid washing may help. To wash your eyelids:

• Apply a warm washcloth to your eyes. Wet a clean cloth with warm water. Hold the cloth over your eyes for five minutes. Rewet the cloth with warm water when it cools. Gently rub the washcloth over your eyelids — including the base of the eyelashes — to loosen any debris.
• Use a mild soap on your eyelids. Use baby shampoo or another mild soap. Put the cleanser on your clean fingertips and gently massage your closed eyes near the base of your eyelashes. Rinse completely.

Further study is needed, but some alternative medicine approaches may help relieve your dry eye symptoms. Discuss the benefits and risks with your eye care specialist.

• Fatty acids. Adding omega-3 fatty acids to your diet may help relieve dry eye signs and symptoms. These are available as supplements and in foods such as flaxseed, salmon and sardines.
• Castor oil eye drops. These eye drops may improve symptoms by reducing tear evaporation.
• Acupuncture. Some people have seen their dry eye symptoms improve after acupuncture therapy.

You're likely to start by seeing your family health care provider. Your provider may then refer you to an eye specialist (ophthalmologist). Because appointments can be brief, it's a good idea to be well prepared for your appointment.

What you can do

• List any symptoms you're experiencing, including any that may seem unrelated to the reason for which you scheduled the appointment.
• List key personal information, including any recent life changes.
• Make a list of all medicines, vitamins and supplements that you're taking.
• List questions to ask during your appointment.

For dry eyes, some basic questions to ask include:

• What's the most likely cause of my dry eyes?
• Do I need any tests?
• Can dry eyes get better on their own?
• What are my treatment options?
• What are the potential side effects of each treatment?
• I have other health conditions. How can I best manage these conditions together?
• Is a generic medicine available for the medicine you're prescribing me?
• Do you have any brochures or other printed material that I can take with me?
• What websites do you recommend?
• Do I need to plan for a follow-up visit?

Don't hesitate to ask additional questions that may occur to you during your appointment.

What to expect from your doctor

You may be asked:

• Can you describe your symptoms?
• Do you recall when you first began experiencing symptoms?
• Have your symptoms been continuous or occasional?
• Do other members of your family have dry eyes?
• Have you tried nonprescription eye drops? Did they provide relief?
• Are your symptoms worse in the morning or late in the day?
• What medicines do you take?
• Have you had any radiation to the head or neck?

What you can do in the meantime

To relieve your signs and symptoms while you wait for your appointment, try nonprescription eye drops. Look for lubricating eye drops, also called artificial tears. Avoid those that advocate reducing redness in the eyes. Eye drops that reduce eye redness can cause additional eye irritation.