Eyes with less than 3 months follow-up

Severe conjunctival adhesions and scarring for the site of surgery

Presence of thin sclera and staphyloma for the site of surgery

The presence or anticipated need for silicone oil for superior implantation

Active neovascular glaucoma for inferior implantation

Results of Different Location of Ahmed Glaucoma Valve Implantation in Refractory Glaucoma, Superior Versus Inferior