The Secondary Beneficial Effects of Prostaglandin Analog Treatment in Thyroid Eye Disease Patients.

Inclusion Criteria: * mild or moderate to severe thyroid eye disease in one or both eyes * age \> 18 years * informed consent * intraocular pressure \> 21 mmHg or glaucoma suspect or glaucoma diagnosed in one or both eyes * not on current prostaglandin analog intraocular pressure lowering therapy Exclusion Criteria: * sight threatening thyroid eye disease * children \< 18 years old * patients that are not compliant with treatment or follow-up * patients already on prostaglandin analog treatment * patients that undergo cosmetic periocular procedures during the study will be excluded from further follow up * patients that cannot tolerate prostaglandin analog treatment. * patients with bilateral thyroid eye disease and elevated intraocular pressures that cannot tolerate treatment with timolol or an alternative intraocular pressure lowering medication such as trusopt, combigan, cosopt.