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Blepharitis ( ) is a common eye condition characterized by chronic inflammation of the eyelid, usually where eyelashes grow, resulting in inflamed, irritated, itchy, and reddened eyelids. A number of diseases and conditions can lead to blepharitis. It can be caused by the oil glands at the base of the eyelashes becoming clogged, a bacterial infection, allergies, or other conditions. The severity and course can vary. Onset can be acute, resolving without treatment within 2–4 weeks (this can be greatly reduced with lid hygiene), but more generally is a long-standing chronic inflammation of varying severity. It may be classified as seborrhoeic, staphylococcal, mixed, posterior or meibomitis, or parasitic.〔 It usually does not cause permanent damage. ==Symptoms== Blepharitis is characterized by chronic inflammation of the eyelid, usually at the base of the eyelashes.〔(Blepharitis Definition - Diseases and Conditions - Mayo Clinic )〕〔(Blepharitis: Symptoms, Treatment, and Prevention )〕〔(Medscape: Medscape Access )〕 This results in inflamed, irritated, itchy, and reddened eyelids.〔〔 It is typically caused bacterial infection, blockage of the eyelid's oil glands, or allergies.〔 Various diseases and conditions can lead to blepharitis, such as rosacea, herpes simplex dermatitis, varicella-zoster dermatitis, molluscum contagiosum, allergic dermatitis, contact dermatitis, seborrheic dermatitis, staphylococcal dermatitis, and parasitic infections (''e.g.'', Demodex and Phthiriasis palpebrarum).〔〔 Symptoms associated with blepharitis include: * Watery eyes〔(Blepharitis Symptoms - Diseases and Conditions - Mayo Clinic )〕 * Red eyes〔 * Red/swollen eyelids〔 * Crusting at the eyelid margins/base of the eyelashes/medial canthus, generally worse on waking〔〔〔 * Eyelid sticking〔 * Eyelid itching〔 * Flaking of skin on eyelids〔 * Gritty/burning sensation in the eye, or foreign-body sensation〔 * Eyelids appear greasy〔 * Frequent blinking〔 * Light sensitivity/photophobia〔〔 * Misdirected eyelashes that grow abnormally〔 * Eyelash loss〔 * Infection of the eyelash follicle/sebaceous gland (hordeolum) * Debris in the tear film, seen under magnification (improved contrast with use of fluorescein drops) Blepharitis usually doesn't cause permanent eyesight damage.〔 Chronic blepharitis may result in damage of varying severity which may have a negative effect upon vision and therefore upon the eyeglass prescription.〔 Long-term untreated blepharitis can lead to eyelid scarring, excess tearing, difficulty wearing contact lenses, development of a stye (an infection near the base of the eyelashes, resulting in a painful lump on the edge of the eyelid) or a chalazion (a blockage/bacteria infection in a small oil glands at the margin of the eyelid, just behind the eyelashes, leading to a red, swollen eyelid), chronic pink eye (conjunctivitis), keratitis, and cornea ulcer or irritation.〔〔(Blepharitis Complications - Diseases and Conditions - Mayo Clinic )〕〔(Medscape: Medscape Access )〕 The lids may become red and may have ulcerative, non-healing areas which may bleed. Blepharitis can cause blurred vision due to a poor tear film.〔 Also, the tears might seem frothy or bubbly in nature and mild scarring might occur to the eyelids. The symptoms and signs of blepharitis are often erroneously ascribed by the patient as being due to "recurrent conjunctivitis". 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Blepharitis」の詳細全文を読む スポンサード リンク
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