Dry eye syndrome
You need tears to moisten the eyes and to wash away particles that have gotten into your eyes. A healthy tear film on the eye is necessary for good vision.
Dry eyes develop when the eye is unable to maintain a healthy coating of tears.
Keratitis sicca; Xerophthalmia; Keratoconjunctivitis sicca
Dry eye commonly occurs in people who are otherwise healthy. It becomes more common with age. This can occur due to hormonal changes that make your eyes produce fewer tears.
Other common causes of dry eyes include:
- Dry environment or workplace (wind, air conditioning)
- Sun exposure
- Smoking or second-hand smoke exposure
- Cold or allergy medicines
- Wearing contact lenses
Dry eye can also be caused by:
- Heat or chemical burns
- Previous eye surgery
- Use of eye drops for other eye diseases
- A rare autoimmune disorder in which the glands that produce tears are destroyed (Sjögren syndrome)
Symptoms may include:
- Blurred vision
- Burning, itching, or redness in the eye
- Gritty or scratchy feeling in the eye
- Sensitivity to light
Exams and Tests
Tests may include:
- Visual acuity measurement
- Slit lamp exam
- Diagnostic staining of the cornea and tear film
- Measurement of tear film break-up time (TBUT)
- Measurement of rate of tear production (Schirmer test)
- Measurement of concentration of tears (osmolality)
The first step in treatment is artificial tears. These come as preserved (screw cap bottle) and unpreserved (twist open vial). Preserved tears are more convenient, but some people are sensitive to preservatives. There are many brands available without a prescription.
Start using the drops at least 2 to 4 times per day. If your symptoms are not better after a couple of weeks of regular use:
- Increase use (up to every 2 hours).
- Change to unpreserved drops if you have been using the preserved type.
- Try a different brand.
- Talk to your health care provider if you cannot find a brand that works for you.
Other treatments may include:
- Fish oil 2 to 3 times per day
- Glasses, goggles or contact lenses that keep moisture in the eyes
- Medicines such as Restasis, Xiidra, topical corticosteroids, and oral tetracycline and doxycycline
- Tiny plugs placed in the tear drainage ducts to help moisture stay on the surface of the eye longer
Other helpful steps include:
- DO NOT smoke and avoid second-hand smoke, direct wind, and air conditioning.
- Use a humidifier, particularly in the winter.
- Limit allergy and cold medicines that may dry you out and worsen your symptoms.
- Purposefully blink more often. Rest your eyes once in a while.
- Clean eyelashes regularly and apply warm compresses.
Some dry eye symptoms are due to sleeping with the eyes slightly open. Lubricating ointments work best for this problem. You should use them only in small amounts since they can blur your vision. It is best to use them before sleep.
Surgery may be helpful if symptoms are because the eyelids are in an abnormal position.
Most people with dry eye have only discomfort, and no vision loss.
In severe cases, the clear covering on the eye (cornea) may become damaged or infected.
When to Contact a Medical Professional
Call your provider right away if:
- You have red or painful eyes.
- You have flaking, discharge, or a sore on your eye or eyelid.
- You have had an injury to your eye, or if you have a bulging eye or a drooping eyelid.
- You have joint pain, swelling, or stiffness and a dry mouth along with dry eye symptoms.
- Your eyes do not get better with self-care within a few days.
Stay away from dry environments and things that irritate your eyes to help prevent symptoms.
Bohm KJ, Djalilian AR, Pflugfelder SC, Starr CE. Dry eye. In: Mannis MJ, Holland EJ, eds. Cornea. 4th ed. Philadelphia, PA: Elsevier; 2017:chap 33.
Dorsch JN. Dry eye syndrome. In: Kellerman RD, Rakel DP, eds. Conn's Current Therapy 2019. Philadelphia, PA: Elsevier; 2019:475-477.
Goldstein MH, Rao NK. Dry eye disease. In: Yanoff M, Duker JS, eds. Ophthalmology. 5th ed. Philadelphia, PA: Elsevier; 2019:chap 4.23.