What Is Dry Eye Syndrome?


Dry Eye is a medical condition of the ocular surface system that affects tear production and/or drainage. It is one of the most common disorders seen in any eye doctor’s office.

 

Patients with Dry Eye may complain of eye stinging, burning, itching, redness, irritation or discomfort. Vision may be blurred, causing difficulty viewing a computer, watching television, or seeing clearly while driving.

 

Left untreated, severe Dry Eye may lead to inflammation/ulceration of the cornea, Meibomian Gland disease, or other ocular complications.

 

 

How are dry eyes tested and diagnosed?

 

The best way to tests for dry eye is the Schirmer test of lacrimation, a test of tear production in keratoconjunctivitis sicca, performed by measuring the area of moisture on a piece of filter paper inserted over the conjunctival sac of the lower lid, with the end of the paper hanging down on the outside.

 

Dry eye is 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 – 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.

 

The most common form of dry eyes is due to an inadequate amount of the water layer of tears. This condition, called keratoconjunctivitis sicca (KCS), is also referred to as dry eye syndrome.

 

People with dry eyes may experience symptoms of irritated, gritty, scratchy, or burning eyes, a feeling of something in their eyes, excess watering, and blurred vision. Advanced dry eyes may damage the front surface of the eye and impair vision.

 

Treatments for dry eyes aim to restore or maintain the normal amount of tears in the eye to minimize dryness and related discomfort and to maintain eye health.