What is Blepharitis?
Blepharitis (ble-fuh-REYE-tis) is a chronic disease of the eyelids, characterised by persistent inflammation of the lid margins.
It is often classified into two types:
Anterior blepharitis mainly affects the outer front edge of the eyelid margin, where the eyelashes grow. It often causes scales around the eyelashes and an overgrowth of bacteria, which produce toxins that enter the tears, irritating the eye.
Posterior blepharitis (meibomian gland dysfunction, MGD) is the most common form of blepharitis. It mainly affects the inner back edge of the eyelid margin, which is in contact with the eye. The meibomian oil glands, located in a row behind the eyelashes, become blocked with thickened waxy oil. This leads to drying of the tears on the surface of the eye because they lack their normal healthy oil coating. It also causes an overgrowth of bacteria, which produce toxins that enter the tears, irritating the eye.
Who gets blepharitis?
Blepharitis is a common condition that can occur in anyone, at any age. It is most common in people with oily skin or Rosacea.
What are the main symptoms of blepharitis?
Blepharitis may cause irritation, burning, itching and the sensation of something scratching the eye. The eyes often become red and watery, but may feel dry. The vision may be variable. The eyelids may appear red-rimmed and there may be crusts in the eyelashes or cysts near the eyelid margins.
Is blepharitis serious?
In most cases blepharitis is annoying but does not cause serious harm to the eye. However, complications of blepharitis may develop, including meibomian cysts, ingrown eyelashes, dry eye and corneal ulcers.
What treatments can help?
There is no simple cure for blepharitis and controlling it often involves a combination of several different treatments:
Eyelid hygiene should be done twice daily for the first few weeks, and then may be reduced to once daily once the blepharitis has improved. There are three components:
Tear supplements often help relieve some of the symptoms of blepharitis by replacing the natural tears, which may be evaporating too fast, and by diluting any toxic chemical in the tears, produced by an overgrowth of bacteria on the eyelid margins. There are numerous different artificial tear drops, which are available without prescription at pharmacies. Most of these drops can be used safely up to four times daily. Should tear supplements be required more frequently, then preservative free ones, which come in boxes of small throw-away vials, are recommended.
Antibiotic ointment may be prescribed for a period of time. It can be applied with a clean fingertip or a cotton bud to the eyelid margins or applied directly into the eye. This helps to reduce the buildup of bacteria in the oil glands and around the eyelashes, which often contribute to the inflammation caused by blepharitis.
Steroid eyedrops may occasionally be prescribed for a short course. They are anti-inflammatory, which reduce the redness, swelling and discomfort caused by blepharitis when it has a significant flare-up. If steroid drops are used you must be closely monitored by your Eye Doctor for potential side effects, such as glaucoma, cataracts and infections.
Oral antibiotics, such as Doxycycline, may be prescribed for more persistent blepharitis. A low dose is normally used for a long course, usually several months. Although generally well-tolerated, potential side effects include sun-sensitivity and abdominal upsets.
Omega 3 supplements, which are widely available over the counter, may be beneficial with long term use. They have anti-inflammatory properties and may also improve the quality of the oil component of the tears.
Other treatments may occasionally be recommended by your Eye Doctor depending on the type and severity of your blepharitis.