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MRI evaluation of Ahmed glaucoma valve bleb and correlation to intraocular pressure in neovascular glaucoma

Poster Details

First Author: C.Kalamkar INDIA

Co Author(s):    A. Mukherjee                    

Abstract Details


To report results of morphological evaluation of blebs in patients with Ahmed Glaucoma Valve(AGV) implant using Magnetic Resonance Imaging (MRI) and to correlated these parameters with pre-operative and post-operative intraocular pressures (IOP).


Shri Ganesh Vinayak Eye Hospital, Raipur, India


Retrospective, consecutive, hospital based case series of 12 adult refractory neovascular glaucoma (NVG) patients who underwent AGV implantation from September 2014 onwards. Minimum follow-up of 6 months. MRI was done to evaluate bleb morphology (bleb height, measurements in 2 axis and bleb volume). Pre-operative and post-operative IOP were correlated with bleb parameters.


There was a positive correlation between post operative IOP and Bleb volume [r = +0.557, p <0.0001] and bleb height [r = +0.406, p<0.0001]. There was no correlation between preoperative IOP or percentage reduction in IOP and bleb parameters. IOP reduced significantly from preoperative levels (preoperative: 41.5 +/- 9.77 mmHg vs. Postoperative: 15.5 +/- 2.28 mm Hg, p < 0.001). MRI demonstrated presence of fluid not only above the AGV plate but also between plate and sclera in all patients. Small sample size and shorter duration of follow-up are the main limitations of this study.


In patients with AGV implant, evaluation of bleb morphology using MRI may provide useful insight into the mechanisms of functioning and failure of AGV

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