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Eye Health

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What is Blepharitis?

Blepharitis refers to inflammation of the eyelid margins. There are two broad categories of the condition - Anterior Blepharitis and Posterior Blepharitis.

Anterior Blepharitis affects the front part of the eyelid margin, near the roots of the eyelashes. It is commonly caused by bacteria that normally lives on our skin and produces an irritate toxin that causes inflammation. The lid margin often looks 'crusty' and when seen under a microscope, the appearance can be similar to dandruff. Anterior Blepharitis can cause the eyelids to become red, itchy and sometimes slightly swollen too.

Posterior Blepharitis is also referred to as Obstructive Meibomian Gland Disease. The meibomian glands are located within the eyelid and the pores of the glands open onto the lid margin, behind the roots of the eyelashes. The glands normally produce a special oily secretion for the tears. The meibomian glands sometimes become inflamed and blocked, causing a reduction in amount and disturbance in quality of the oily secretions. This does not only cause eyelid margin irritation, but also has secondary dry eye effects on the ocular surface.

Who gets Blepharitis?

Blepharitis is very common indeed - 5% of eye problems in primary care are said to be related to blepharitis. People of any age can be sufferers, but it is more common in older people over the age of 50. It is not something 'caught' or inherited. The causes of some people developing blepharitis is poorly understood.

What are the Symptoms of Blepharitis?

People who have blepharitis may not suffer from any symptoms at all. However, for those that do report symptoms, one or any combination of the following symptoms are common:

 

  • Irritation of the eyelids and/or eyes

  • Redness of the eyes

  • Sore eyelids - sometimes red and swollen lid margins

  • Crusting of the eyelid margins

  • Eyelids may stick together on waking in mornings

  • Burning and tearing of the eyes

  • Gritty sensation in eyes

  • Pain on looking at bright lights (photophobia)

  • Small eyelid margin cysts.

 

How is Blepharitis Diagnosed?

Blepharitis is normally diagnosed in primary care by GPs on the clinical history alone. When a slit lamp microscope is available, for example at the optometrist's or ophthalmologist's clinic, the lid margin can be examined closely. Simple visualisation of the lid margin along with the history is how the diagnosis is normally made.

How is Blepharitis Treated?

Unfortunately, there is not a definitive cure for blepharitis. There are many different ways clinicians have managed patients with blepharitis over the years.

 

The fact there is not a definitive treatment is an indicator that no single treatment works significantly better than all others.

If you are concerned about your eye health, your optician can advise you on the diagnosis and best treatment available to you.