Patients having had an ophthalmic surgical procedure within 6 months of the beginning of the study.
Patients with a diagnosis of glaucoma
Any abnormality of the cornea which may prevent reliable applanation tonometry
Known allergy/ hypersensitivity reaction to Brimonidine
Contra-indication to Brimonidine including patients on monoamine oxidase inhibitors (MOA)
Patients unwilling or unable to provide informed consent
Patients with anticipated difficult airway management (as this may require medications and/or airway manipulations resulting in increased IOP)

NCT02818816_exc_T1
Procedure
ophthalmic surgical procedure
NCT02818816_exc_T2
Temporal
within 6 months of the beginning of the study
NCT02818816_exc_T3
Reference_point
study
NCT02818816_exc_T4
Condition
glaucoma
NCT02818816_exc_T5
Condition
abnormality
NCT02818816_exc_T6
Qualifier
cornea
NCT02818816_exc_T7
Condition
allergy
NCT02818816_exc_T8
Condition
hypersensitivity
NCT02818816_exc_T9
Drug
Brimonidine
NCT02818816_exc_T10
Scope
allergy/ hypersensitivity
NCT02818816_exc_T11
Condition
Contra-indication
NCT02818816_exc_T12
Drug
Brimonidine
NCT02818816_exc_T13
Drug
monoamine oxidase inhibitors
NCT02818816_exc_T14
Drug
MOA
NCT02818816_exc_T16
Observation
difficult airway management