Use travatan z in 1eye for glaucoma.. have noticed vision is not as clear and crisp at times. can this be caused by travatan? i wear contacts.

Unlikely: Travatan has no impact on eye focusing. It diffuses into the eye and affects the fluid flow to treat the elevated pressure of glaucoma. If the vision is variable there might be some element of problem with the fit of the contacts or the basic tear thickness of your eye unrelated to travatan. If this is too annoying, then see your ophthalmologist for a refit.

Possible: Intermittent blurring is typically a tear film issue, commonly dry eye. Occasionally topical drops cause dryness, so do contact lens. Best to get the contact lens fit and prescription checked.