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Related Concept Videos

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The muscles of the eye are sophisticated structures that control eye movement and focus, allowing for the precise and rapid adjustments necessary for vision. The human eye is controlled by ten muscles — six extraocular muscles, three intraocular muscles, and one primary eyelid retractor muscle.
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Related Experiment Video

Updated: Jun 20, 2026

Surgical Correction for Pediatric Epiblepharon and Trichiasis
03:59

Surgical Correction for Pediatric Epiblepharon and Trichiasis

Published on: July 8, 2025

Double eyelid operation recreating the anatomic microstructure.

Xu Fengzhi1, Zeng Wei, Fan Guo-Kang

  • 1Department of plastic and reconstructive surgery, 2nd Affiliated Hospital, School of Medicine, Zhejiang University, Hanghzhou, Zhejiang, China.

Annals of Plastic Surgery
|August 21, 2009
PubMed
Summary
This summary is machine-generated.

This study confirms Sayoc's theory on double eyelid formation by proving the fusion of levator aponeurosis fibers and pretarsal skin in Asian eyelids. This anatomical finding enhances upper blepharoplasty outcomes, ensuring natural results and faster recovery.

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Area of Science:

  • Oculoplastic surgery
  • Anatomy
  • Histology

Background:

  • Upper blepharoplasty is a popular cosmetic procedure in East and Southeast Asia.
  • The precise mechanism of double eyelid formation in Asians remains debated.
  • Existing surgical techniques vary due to the controversial etiology of the Asian double eyelid.

Purpose of the Study:

  • To anatomically investigate the inferior portion of the upper eyelid in Asian populations.
  • To provide direct evidence for or against Sayoc's theory regarding double eyelid formation.
  • To correlate anatomical findings with clinical outcomes in upper blepharoplasty.

Main Methods:

  • Anatomical dissection of the inferior part of the upper eyelid.
  • Histological examination using both light and electron microscopy.
  • Clinical application and assessment of surgical reapproximation in a large patient cohort.

Main Results:

  • Direct anatomical evidence confirming the fusion of levator aponeurosis fibers with pretarsal skin was identified.
  • Sayoc's theory regarding the anatomical basis of the double eyelid was validated in the Asian eyelid.
  • Clinical trials demonstrated successful reapproximation, yielding natural-looking results with zero postoperative blepharoptosis and reduced recovery times.

Conclusions:

  • The study provides definitive anatomical proof for Sayoc's theory in Asian eyelids.
  • This anatomical understanding facilitates improved surgical techniques for upper blepharoplasty.
  • Optimized surgical approaches based on this anatomy lead to superior aesthetic and functional outcomes.