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Anterior segment optical coherence tomography analysis of tube ligation after Ahmed glaucoma valve implantation

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Session Details

Session Title: Presented Poster Session: Glaucoma and Imaging

Venue: Poster Village: Pod 3

First Author: : S.Rho SOUTH KOREA

Co Author(s): :    S. Lim              

Abstract Details


To assess the characteristics of tube ligation status after Ahmed glaucoma valve implantation using anterior segment optical coherence tomography (AS-OCT)


CHA Bundang Medical Center, CHA University


A total of 23 refractory glaucoma eyes underwent Ahmed glaucoma valve in CHA Bundang Medical Center was retrospectively enrolled. Tube was ligated with 7-0 Vicryl in between 2 and 4 mm apart from the plate and covered by a 4 x 4 mm sized right-angled triangle shape scleral flap. The maintenance of the tube ligation was confirmed when the shadowing of the thread or the narrowing / bending of the tube was noted.


The maintenance of the tube ligation was noted in 20, 14, and 7 eyes after 1, 2, and 3 months, respectively. The average inner diameters of the tube were and 66 ± 56 μm and 299 ± 12 μm with the ligation maintained and the ligation not maintained, respectively.


The tensile strength of Vicryl is generally known to be about 50% after 3 weeks and it is fully degraded after 2 months in vivo. However, the AS-OCT images showed that the tube ligation was maintained up to 3 months postoperatively in some cases. This finding could explain the frequency of hypo- or hyper-tensive cases.

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