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. 2018 Jan 19;32(2):230–234. doi: 10.1038/eye.2017.316

Table 1. Contemporary glaucoma drainage devices.

GDDs Year of introduction Tube diameter/material Plate size/material Resistance mechanism
Molteno 1979 0.63 mm OD 0.30 mm ID Silicone 135 mm2 Polypropylene None
Baerveldt 1990 0.63 mm OD 0.30 mm ID Silicone 250 & 350 mm2 Silicone None
Ahmed 1993 0.63 mm OD 0.30 mm ID Silicone 185 mm2 Polypropylene with Silicone valve Venturi Valve

Abbreviations: OD, outside diameter; ID, inside diameter.