RT Journal Article SR Electronic T1 Histological appearances of the levator palpebrae superioris muscle in the Marcus Gunn phenomenon. JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 104 OP 109 DO 10.1136/bjo.72.2.104 VO 72 IS 2 A1 Lyness, R. W. A1 Collin, J. R. A1 Alexander, R. A. A1 Garner, A. YR 1988 UL http://bjo.bmj.com/content/72/2/104.abstract AB The levator palpebrae superioris muscles from 12 cases of Marcus Gunn phenomenon were examined histologically by means of histochemistry and morphometry. The appearances were of a neurogenic atrophy with pathological changes occurring in both the affected side and the clinically normal side, suggesting that the causative lesion was located in the central nervous system.