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The natural tears that your eyes produce are composed of three layers
the outer oily layer
the middle watery layer
the inner mucus layer

Dry eye is the term used to describe eyes that do not produce enough tears or tears with the proper chemical composition in any of these layers.

Dry eye is most often a result of eyes' natural aging process.  Most peoples' eyes tend to become drier as they age, but the degree of dryness varies and some people have more problems than others.  In addition to age, dry eye can result from:

problems with normal blinking

certain medications like antihistamines, oral contraceptives and antidepressants

environmental factors like a dry climate and exposure to wind

general health problems like arthritis or Sjogren's syndrome

chemical or thermal burns to the eye

Dry eye symptoms are often different in different people, but the following are commonly experienced by those whose tear production is inadequate:

irritated, scratchy, dry or uncomfortable eyes

redness of the eyes

a burning sensation of the eyes

a feeling of a foreign body in the eye

blurred vision

excessive watering as the eyes try to comfort an overly dry eye

eyes that seem to have lost the normal clear glassy luster

If untreated, dry eye can be more than just irritating or uncomfortable.

Excessive dry eye can damage eye tissue and possibly scar the cornea, the transparent front covering of the eye, impairing vision.  Contact lens wear may be more difficult due to the possibility of increased irritation and a greater chance of eye infection.

If you are experiencing the symptoms of dry eye, your optometrist can perform "dry eye" tests using diagnostic instruments to give a highly magnified view and special dyes to evaluate the quality, amount and distribution of tears.  Your optometrist will also need to know about your every day activities, your general health, medications you are taking and about environmental factors that may be causing your symptoms.

Unfortunately, dry eye cannot be cured, but your eye's sensitivity can be lessened and treatment prescribed so that your eyes remain healthy and your vision is not affected.  

Possible treatments include:

frequent blinking to spread tears over the eye, especially when using a steady focus for an extended period

changing environment factors like avoiding wind and dust and increasing the level of humidity

using artificial tear solutions

using moisturizing ointment, especially at bedtime

Other form of medication:

insertion of small plugs in the corner of the eyes to slow drainage and loss of tears

in rare cases, surgery may be recommended

Whatever treatment is prescribed for you, it is very important that you follow your doctor of optometry's instructions carefully.  Dry eye does not go away, but by working together, you and your doctor can keep your eyes healthy and protect your good vision.

- Information provided by the American Optometric Association -

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2001Valley Eye Professionals
12229 Ventura Boulevard
Studio City, California 91604
Office: (818) 623-8900
Fax:     (818) 623-0978