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| Inclusion Criteria |
| IOP in one eye of ≥ 24 mm Hg and ≤ 32 mm Hg. |
| IOP in fellow eye of ≥ 21 mm Hg and ≤ 32 mm Hg. |
| Age 40 to 80 years. |
| Normal and reliable Humphrey 30-2 visual fields for both eyes as determined by the Visual Field Reading Center. |
| Normal optic discs in both eyes on clinical examination and on photographs as determined by the Optic Disc Reading Center. |
