Marcus Gunn Jaw-Winking Phenomenon as a Boon in Mild–Moderate Ptosis for Prevention of Amblyopia- Case Series

Abstract Purpose: To highlight the functional advantage of Marcus Gunn jaw-winking phenomenon (MGJWP) in reducing the risk of amblyopia in patients with mild to moderate congenital ptosis. Methods: An observational analysis was conducted on patients with MGJWP and mild–moderate ptosis attending the Department of Ophthalmology, Tezpur Medical College and Hospital, Tezpur, Assam. Uncorrected visual acuity (UCVA), best-corrected visual acuity (BCVA), and amblyopia-related risk factors were assessed. Results: Most patients demonstrated good BCVA despite delayed or absent surgical intervention. Intermittent eyelid elevation during jaw movements resulted in periodic clearance of the visual axis, potentially reducing stimulus-deprivation amblyopia. Conclusion: In selected cases of mild to moderate ptosis, MGJWP may act as a functional protective factor against amblyopia. Conservative management with close visual monitoring may be appropriate when no other amblyogenic factors are present. Keywords: Marcus Gunn jaw-winking phenomenon; congenital ptosis; amblyopia; synkinesis; pediatric ophthalmology