Blepharitis classificationBlepharitis classification will depend on the site of blepharitis which can be either anterior Blepharitis or posterior Blepharitis
Anterior Blepharitis:There will be inflammation of the anterior part of the eyelid margin where the eyelashes are attached.Causes of anterior blepharitis:1- Bacterial infection like staphylococcal infection. These bacteria normally present on the eyelid margin and do not cause symptoms but overgrowth of them will lead to infection with symptoms of Blepharitis.Also infestation of the eyelash with lice like demodex folliculorum can cause anterior Blepharitis.2- Seborrheic blepharitis in which it occur in patient with seborrheic dermatitis (scalp dandruff and eyebrows dandruff). It is characteristic by oily skin and flaking from the scalp or brows. There will be excessive lipid secretion on the eyelid margins which are broken down by special bacteria called corynebacterium acnes. The breakdown products will cause inflammation of the eyelid margin.3- Other causes of dermatitis: herpes simplex virus infection, Varicella-Zoster dermatitis, Molluscum contagiosum dermatitis and allergic or contact dermatitis.Allergy can be caused by many factors like drugs and environmental factors. Posterior Blepharitis:There are special glands at the posterior margin of the eyelid called meibomian glands which secret lipid into the anterior surface of the eye and it is a component of eye tears. Posterior Blepharitis is mainly related to meibomian gland dysfunction. With time these secretions will block the orifice of these glands and the stagnant material becomes a good growth medium for the bacteria to live causing eyelid inflammation and infection.Causes of posterior blepharitis:1- Meibomian seborrhoea. In which there is excessive lipid secretion and these lipids will be deposited on the posterior margin of the eyelid. It is usually associated with acne rosacea which is associated with pustules, rhinophyma (red swollen nose), telangiectasia (diluted vessels of the skin, nose or eyelid) and erythema of the skin and eyelid margins.2- Meibomianitis: In meibomitis there will be infection or inflammation of these glands with obstruction of ducts.
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