Surface electromyography analysis of blepharoptosis correction by transconjunctival incisions

Lung Chen Tu, Ming Chya Wu*, Hsueh Liang Chu, Yi Pin Chiang, Chih Lin Kuo, Hsing Yuan Li, Chia-Ching Chang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Upper eyelid movement depends on the antagonistic actions of orbicularis oculi muscle and levator aponeurosis. Blepharoptosis is an abnormal drooping of upper eyelid margin with the eye in primary position of gaze. Transconjunctival incisions for upper eyelid ptosis correction have been a well-developed technique. Conventional prognosis however depends on clinical observations and lacks of quantitatively analysis for the eyelid muscle controlling. This study examines the possibility of using the assessments of temporal correlation in surface electromyography (SEMG) as a quantitative description for the change of muscle controlling after operation. Eyelid SEMG was measured from patients with blepharoptosis preoperatively and postoperatively, as well as, for comparative study, from young and aged normal subjects. The data were analyzed using the detrended fluctuation analysis method. The results show that the temporal correlation of the SEMG signals can be characterized by two indices associated with the correlation properties in short and long time scales demarcated at 3 ms, corresponding to the time scale of neural response. Aging causes degradation of the correlation properties at both time scales, and patient group likely possess more serious correlation degradation in long-time regime which was improved moderately by the ptosis corrections. We propose that the temporal correlation in SEMG signals may be regarded as an indicator for evaluating the performance of eyelid muscle controlling in postoperative recovery.

Original languageEnglish
Pages (from-to)23-30
Number of pages8
JournalJournal of Electromyography and Kinesiology
StatePublished - 1 Jun 2016


  • Blepharoptosis
  • Detrended fluctuation analysis
  • Surface electromyography
  • Transconjunctival incision


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