67 © Springer Nature Singapore Pte Ltd. 2019 M. Gandhi, S. Bhartiya (eds.), Glaucoma Drainage Devices, https://doi.org/10.1007/978-981-13-5773-2_10 AADI Technique Suresh Kumar and Sahil Thakur 10.1 Introduction Aurolab aqueous drainage implant (AADI) has been marketed in India by Aurolab, Madurai, India, since June 2013. AADI is a non-valved device that is useful in refractory glaucomas when other methods to control the intraocular pressure have failed. It is made of permanent implantable grade silicone, a proven material for patient safety [1]. The implant plate surface area is 350 mm 2 , and it has lateral wings that are designed to be placed under the rectus muscle. It is a 35 mm silicon tube attached to a 13 mm con- vex radius plate which conforms to the curvature of the globe. It has additional holes to facilitate anchoring of the end plate to the sclera so as to minimise device movement. There are various surgical methods of implanting a glaucoma drainage device which have been elucidated in this chapter. 10.2 Dissection of the Conjunctiva A peripheral clear corneal 6-0 Vicryl or 6-0 Prolene suture to provide traction and exposure of the surgical field (Fig. 10.1). The conjunctival peritomy is started in the supero-temporal quadrant to raise a fornix-based conjunctival flap. The preferred location for the implant is supero-temporal quadrant because of more space available in this area. In case of scar- ring in this region, the supero-nasal quadrant can be used for implant placement. The inferior quadrants are not preferred because of risk of endophthalmitis. Before making a conjunctival incision, it is preferable to inject around 0.5 ml of 4% xylocaine with adrenalin solution under the conjunctiva that aids both in haemostasis and mechanical separation of the tissue from the sclera. Additionally, most of the eyes requiring S. Kumar (*) Department of Ophthalmology, GMCH, Chandigarh, India S. Thakur Department of Ocular Epidemiology, Singapore Eye Research Institute, Singapore, Singapore 10 Electronic Supplementary Material The online version of this chapter (https://doi.org/10.1007/978-981-13-5773- 2_10) contains supplementary material, which is available to authorized users. Fig. 10.1 Corneal traction suture and dissection bleb raised using lignocaine