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Meibomian gland orifices and expression of the meibomian glands. Image from a patient with posterior blepharitis/meibomian gland dysfunction (MGD). Obstruction of the orifices of the meibomian glands and alterations in the meibum, leading to turbid, thickened secretions, can occur in patients with blepharitis/MGD. © 1994 American Academy of Ophthalmology.
