{"id":7550,"date":"2020-08-27T12:56:42","date_gmt":"2020-08-27T12:56:42","guid":{"rendered":"https:\/\/www.optometrists.org\/?page_id=7550"},"modified":"2021-07-27T10:29:19","modified_gmt":"2021-07-27T10:29:19","slug":"how-does-the-demodex-mite-cause-blepharitis","status":"publish","type":"page","link":"https:\/\/www.optometrists.org\/general-practice-optometry\/guide-to-eye-conditions\/dry-eye\/eyelid-conditions\/blepharitis\/how-does-the-demodex-mite-cause-blepharitis\/","title":{"rendered":"How Does the Demodex Mite Cause Blepharitis?"},"content":{"rendered":"

What are demodex mites?<\/strong><\/h2>\n

The demodex mite can cause blepharitis, resulting in inflammation of the eyelids and severe dry eye.<\/strong><\/p>\n

Demodex folliculorum is a type of demodex mite that lives mostly within the hair follicles on the face and the eyes and is usually found on the eyelids and lashes.<\/p>\n

Demodex mites come out during the night to eat dead skin cells, lay eggs and expel waste products in your eyelid glands and eyelash follicles.<\/p>\n

Demodex mites naturally occur on the skin in small amounts and can actually be beneficial for the skin, as they remove the dead skin cells. In small numbers, they typically do not cause any harm or symptoms.<\/p>\n

However, if they reproduce in large numbers, they can cause significant damage to the skin and eyes\u2014 dry, red, and itchy skin, and\/or eczema, as well as severe inflammation of the eyelids, and damage to the oil glands in the eyelid margins, meibomian glands<\/a> and eyelashes.<\/p>\n

How does a demodex mite infestation cause blepharitis?<\/b><\/h2>\n

Blepharitis<\/a> affects up to 45 percent of people and occurs when the eyelids become inflamed. Blepharitis typically occurs as a result of a blockage in the oil glands at the base of the eyelashes, sometimes as a result of a demodex mite infestation.<\/p>\n

Demodex mites become more prevalent with age, and are typically the cause of blepharitis in patients over the age of 60.\u00a0\u00a0<\/b><\/p>\n

Additionally, patients with chronic rosacea tend to have more demodex mites than people without rosacea, putting them at a higher risk of developing demodex blepharitis.<\/p>\n

What are the symptoms of demodex blepharitis?<\/b><\/h2>\n

Common eye symptoms include:<\/p>\n