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Toshu Inoue, Ai Kozaki, Rishu Inoue, Koichi Nishiyama, Junko Suzuki, Chika Funaki, Yoichi Inoue; Upper Eyelid retraction and Upper Eyelid Lag in Dysthyroid Ophthalmopathy. Invest. Ophthalmol. Vis. Sci. 2011;52(14):5109.
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The aim of this study is to evaluate the relationship between Upper Eyelid Retraction (UER) and Upper Eyelid Lag (UEL) on downward gage in patients with Dysthyroid Ophthalmopathy (DO). A close association exists between UER and UEL, but UEL dose not always associate UER. It has been reported that both of the sympathetic over action of Müller muscle and enlargement of levator palpebral muscle (LPM) - superior rectus muscle (SRM), which is called L-S complex, could produce UER.
Four types of UER have been classified using orbital MRI. L-group is enlargement of LPM, S-group is enlargement of SRM, L-S group is enlargement of L-S complex and M group is no enlargement of L-S complex which means the group of Müller muscle. Thirty eyes of 30 patients with UER in each group were examined, and the incidence of UEL was determined.
The incidence of UEL was 22/30 in L-group, 18/30 in L-S complex group, 15/30 in M-group and 12/30 in S-group. Between L-group and S-group, the incidence of UEL was significantly different (p=0.019).
LPM is considered to have a close relationship with the advent of UEL. Müller muscle makes it possible to cause UEL.
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