Blepharitis is an inflammation process affecting the eyelid margins, eyelash follicles or openings of the anteriorly-placed accessory lacrimal glands and the posteriorly-placed Meibomian glands that causes ocular irritation and redness acutely but usually chronically.
It may have periods of exacerbations and remissions.
It usually occurs in middle-aged adults but can also start in childhood.
Can affect vision by disrupting the surface of the cornea and the bulbar conjunctiva; may influence tear film composition.
Unusual involvement of the eyes with atypical presentations may occur in patients with inflammatory bowel diseases (IBD) on antitumour necrosis factor (anti-TNF) therapy, according to a recent study presented at the 2019 Advances in Inflammatory Bowel Diseases Annual Meeting (AIBD 2019).