Retrograde infusion of fluorescein to confirm location and patency of a glaucoma drainage device

Background: During surgical revision of a glaucoma drainage device, the sta tus of the implant tube can be in question. We report two cases in which re trograde infusion of fluorescein-stained balanced salt solution was used to confirm the patency and location of the tube. Methods: Fluorescein-stained balanced salt solution was made by dipping a s terile fluorescein strip into a 3-mL syringe of balanced salt solution unti l the fluid was visibly yellow. A 30-gauge canula was inserted into the tub e at the reservoir end, and fluorescein-stained balanced salt solution was infused into the eye. Results: Retrograde infusion of fluorescein-stained balanced salt solution confirmed the location and patency of the glaucoma drainage device implant tube, obviating the need for more extensive surgical intervention in these two cases. Neither patient experienced an adverse event. Conclusion: Retrograde infusion of fluorescein-stained balanced salt soluti on is a useful adjunctive technique for surgical revision of glaucoma drain age devices.