In the UK it is estimated that blepharitis is responsible for 5% of all eye problems reported to general practitioners.[7] Blepharitis is one of the most common ocular diseases encountered by ophthalmologists. One survey in the US reported that 37% of patients seen by ophthalmologists had signs of blepharitis.[8] A nationwide cohort study in South Korea found an incidence of 1.1 per 100 person-years between 2004 and 2013.[9] 

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