Mean (SD) values for the IOP before and during treatment
| Pretreatment IOP Mean (SD) | IOP on treatment Mean (SD) | Change in IOP Mean (SD) | |
| POAG eyes: | |||
| Betaxolol (n = 19) | 24.1 (2.5) | 18.5 (4.0) | 5.6 (4.2) |
| Brimonidine (n = 17) | 23.6 (1.3) | 18.0 (2.4) | 5.6 (2.4) |
| Latanoprost (n = 18) | 25.6 (3.2) | 16.7 (3.0) | 8.9 (2.6) |
| Timolol (n = 18 | 25.2 (3.6) | 17.4 (3.4) | 7.8 (3.2) |
| NTG eyes: | |||
| Betaxolol (n = 15) | 17.3 (1.7) | 14.5 (2.0) | 2.8 (2.3) |
| Brimonidine (n = 17) | 17.2 (2.1) | 13.4 (2.8) | 3.8 (2.6) |
| Latanoprost (n = 15) | 16.6 (2.3) | 12.5 (2.5) | 4.1 (2.6) |
| Timolol (n = 15) | 17.7 (2.4) | 15.0 (2.6) | 2.7 (2.8) |