Study	Reason for exclusion
Araie 2003	60% of the included patients had NTG.
EMGT 1999	This RCT included patients with OAG irrespectively to their IOP. Almost 50% of the subjects were NTG patients. Additionally the trial included also patients with PEX. The study intervention also included laser treatment in one group.
Holmin 1988	The study compares medical treatment with no treatment. The treatment allowed use of timolol, pilocarpine and a supplementation with acetazolamide.
Vainio 1999	This trial included both NTG and POAG with elevated IOP

IOP: intraocular pressure 
 NTG: normal tension glaucoma 
 OAG: open angle glaucoma 
 POAG: primary open angle glaucoma 
 PEX: pseudoexfoliation 
 RCT: randomised controlled trial