Table 1.

Summary of various GDDs.

Devices		Molteno implant	Baerveldt glaucoma implant	Ahmed glaucoma valve	Ahmed ClearPath	Paul glaucoma implant	The eyeWatch implant
Regulatory status		CE mark, FDA approval	CE mark, FDA approval	CE mark, FDA approval	CE mark, FDA approved since 2019	CE mark granted in 2018	CE mark granted in 2017
Manufacturer, Country		Molteno Ophthalmic Limited, Dunedin, New Zealand	Abbot Medical Optics Inc., Santa Ana, CA, USA	New World Medical Inc., Rancho Cucamonga, CA, USA	New World Medical Inc., Rancho Cucamonga, CA, USA	Advanced ophthalmic innovations PTE. LTD. Singapore	Rheon Medical, Lausanne, Switzerland
Material	Tube	Silicone	Silicone	Silicone	Silicone	Silicone	Silicone
	Plate	Polypropylene	Silicone	Silicone; Polypropylene; Porous polyethylene	Silicone	Silicone	Silicone (eyePlate)
Tube Diameter	external	0.60 ​mm	0.64 ​mm	0.635 ​mm	0.635 ​mm	0.467 ​mm	0.30 ​mm (implant) 0.63 ​mm (eyePlate)
	internal	0.30 ​mm	0.32 ​mm	0.305 ​mm	0.305 ​mm	0.127 ​mm	0.20 mm/0.30 ​mm (Plate)
Tube Length		/	32 ​mm (BG101-3 50; 103–250) 7 ​mm (Pars Plana; BG 102–350）	25.00 ​mm	32.00 ​mm	Around 29.00 ​mm	/
Plate size	Thickness	0.70 ​mm (edge rim)	0.50–2.00 ​mm	0.90 ​mm (Valve)	0.86 ​mm (Max)	0.95 ​mm (Max)	0.80 ​mm
	Long ​× ​wide	13.00 ​mm in diameter (circle)	22.00 ​mm in length (250) 32.00 ​mm in length (350)	13.0 mm∗16.0 mm (FP7)	16.70 mm ∗18.47 mm or 16.48 mm ∗30.47 ​mm	21.9 mm ∗16.1 mm	6.5 mm∗5.8 mm (implant) 14.5 mm∗16.8 mm (eyePlate-200) 18.5 mm∗18.9 mm (eyePlate-300)
	Surface area	135 ​mm2	250–350 ​mm2	96–364 ​mm2	250 or 350 ​mm2	342 ​mm2	200 or 300 ​mm2
Mechanism		Non-valvular	Non-valvular	Pressure-sensitive valvular	Non-valvular	Non-valvular	Adjustable device