I see and treat a lot of patients with blepharitis and meibomian gland dysfunction. Blepharitis is an inflammatory condition of the lid margin where there is typically a sensitivity to normal skin bacteria such as Staphylococcus Aureus. Due to it's close contact with the eye's surface blepharitis typically causes dry eye, irritation and redness of the eye. Part of the treatment regime for blepharitis includes regular lid cleaning to remove build up of oil and skin flakes from the lid margin and to reduce bacterial load. One recent useful tip from a female patient who wanted to wear occasional mascara was to use disposable mascara brushes to avoid harbouring staphylococcus and other bugs in the make brush. These are available through amazon and are very reasonably priced for hundreds of brushes. Great idea!