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(a) In vivo confocal microscopy showing the meibomian gland duct of one of the meibomian glands of the upper eyelid. Large arrows show the wall of the terminal duct and small arrows show the meibum within. (b) The multiple irregular globular structures (arrows) indicate the acini of meibomian glands. (c) The orifice of a single meibomian gland is shown by the asterix.
