Dry Eye Center

What is Dry Eye?
​The American Optometric Association defines dry eye as a condition in which there are insufficient tears to lubricate and nourish the eye. Tears are necessary for maintaining the health of the front surface of the eye and for providing clear vision. People with dry eyes either do not produce enough tears or have a poor quality of tears. Dry eye is a common and often chronic problem, particularly in older adults.

With each blink of the eyelids, tears are spread across the front surface of the eye, known as the cornea. Tears provide lubrication, reduce the risk of eye infection, wash away foreign matter in the eye, and keep the surface of the eyes smooth and clear. Excess tears in the eyes flow into small drainage ducts, in the inner corners of the eyelids, which drain in the back of the nose.

​Dry eyes can result from an improper balance of tear production and drainage.

• Inadequate amount of tears (keratoconjunctivitis or KCS) – Tears are produced by several glands in and around the eyelids. Tear production tends to diminish with age, with various medical conditions, or as a side effect of certain medicines. Environmental conditions such as wind and dry climates can also affect tear volume by increasing tear evaporation. When the normal amount of tear production decreases or tears evaporate too quickly from the eyes, symptoms of dry eye can develop.
• Poor quality of tears – Tears are made up of three layers: oil, water, and mucus. Each component serves a function in protecting and nourishing the front surface of the eye. A smooth oil layer helps to prevent evaporation of the water layer, while the mucin layer functions in spreading the tears evenly over the surface of the eye. If the tears evaporate too quickly or do not spread evenly over the cornea due to deficiencies with any of the three tear layers, dry eye symptoms can develop.

What are the symptoms of Dry Eye?

• Irritated, gritty, scratchy or burning sensations
• Feeling as if there is a foreign object in the eye
• Excess watering
• Blurred vision
• Advanced dry eye can cause damage to the front of the eye resulting in impaired vision​

What Causes Dry Eyes?
According to the American Optometric Association, The majority of people over the age of 65 experience some symptoms of dry eyes.
The development of dry eyes can have many causes. They include:

• Age – dry eye is a part of the natural aging process. The majority of people over age 65 experience some symptoms of dry eyes.
  
  
• Gender – women are more likely to develop dry eyes due to hormonal changes caused by pregnancy, the use of oral contraceptives, and menopause.
  
  
• Medications – certain medicines, including antihistamines, decongestants, blood pressure medications and antidepressants, can reduce the amount of tears produced in the eyes.
  
  
• Medical conditions – persons with rheumatoid arthritis, diabetes and thyroid problems are more likely to have symptoms of dry eyes. Also, problems with inflammation of the eyelids (blepharitis), inflammation of the surfaces of the eye, or the inward or outward turning of eyelids can cause dry eyes to develop.
  
  
• Environmental conditions – exposure to smoke, wind and dry climates can increase tear evaporation resulting in dry eye symptoms. Failure to blink regularly, such as when staring at a computer screen for long periods of time, can also contribute to drying of the eyes.
  
  
• Other factors – long term use of contact lenses can be a factor in the development of dry eyes. Refractive eye surgeries, such as LASIK, can cause decreased tear production and dry eyes.

How are Dry Eyes Diagnosed?
Dry eye can typically be diagnosed through a comprehensive eye exam. If dry eye is suspected, additional testing with an emphasis on the quantity and quality of tear production may be done as well. This can include:

• Patient history to determine any symptoms the patient is experiencing and the presence of any general health problems, medications taken, or environmental factors that may be contributing to the dry eye problem.
  
  
• External examination of the eye, including lid structure and blink dynamics.
  
  
• Evaluation of the eyelids and cornea using bright light and magnification.
  
  
• Measurement of the quantity and quality of tears for any abnormalities. Special dyes may be instilled in the eyes to better observe tear flow and to highlight any changes to the outer surface of the eye caused by insufficient tears.