Dear madam, Since your husband is suffering from glaucoma
and the IOP is not controlled by medication or drops he requires filtering surgery.Depending on surgeon he may wish to do trabeculectomy
or EX-press shunt.From your query I could make out that the surgeon is planning for Ex-press mini glaucoma shunt which is a new technique. It has good results in patients.It is about the size of a rice grain ie 3mm and is put under a scleral flap for the fluid inside the eye to be drained.It has complications like extrusion of implant, hypotony, and blockage of the shunt.But these things can be managed easily .The advantage of surgery is ,you may not use the IOP lowering drops and the nerve damage
is stabilized.I advise your husband to go for surgery as there is always a risk benefit ratio in all surgeries....TC Bye...Dr Ajay Shankar Kar, Cornea
consultant, Sankar Foundation eye hospital, Vizag.