A study in Ophthalmology noted a high correlation between those with facial rosacea and Demodex mites (and B oleronius, a bacteria associated with the mites). The authors suggest that lid scrubs with tree tea oil may be of benefit. I would imagine any patient with significant Meibomian gland disease who does not respond to typical Rx may benefit as well. The authors note that cylindrical dandruff along the base of the eyelash is pathognomonic for Demodex.