Term used to refer to the muscles that open the eyelids. In the upper eyelid it is the levator palpebrae muscle and its two divisions; the striated levator aponeurosis and the smooth Müller's muscle (or superior tarsal muscle). In the lower eyelid it is the smooth fibre bundle derived from the inferior rectus muscle that forms the inferior tarsal muscle. See levator palpebrae superioris muscle; Müller's palpebral muscles.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann