Pregnant and lactating women, or women who intend to become pregnant during the study period.

Advanced and serious glaucoma, as specified in protocol.

Complicated chronic or recurrent uveitis, scleritis or corneal herpes.

History of ocular trauma, intraocular surgery or laser surgery for the included eye.

Ocular-infection and severe ocular complication.

Best-corrected visual acuity (BCVA) worse than 0.2 decimal.

Difficulty in conducting applanation tonometry for the included eye as determined by the doctor.

Severe or serious hypersensitivity to prostaglandin analogues or any ingredients used in the study.

Use of IOP lowering ophthalmic solutions other than TRAVATAN Z® or oral carbonic anhydrase inhibitor (Diamox, etc.) during the study period.

Use of any adrenocorticosteroids during the study period.

Use of IOP lowering ophthalmic solution within the past 30 days.

Regarded by doctor as not suitable for study participation.

Investigation of Intraocular Pressure (IOP) Reduction Efficacy of Travoprost Ophthalmic Solution in Patients With Normal Tension Glaucoma