Alpha2 adrenergic agonists are nowadays used topically as eye drops in glaucoma treatment. In addition to their known effect of lowering intraocular pressure, alpha2 adrenoceptor agonists are neuroprotective. Brimonidine, which is the most commonly used topical alpha-2 agonist, is currently on the market for treatment of glaucoma and is effective in reducing intraocular pressure. It has, however, been shown that brimonidine is a very potent vasoconstrictor in the ciliary body thus reducing aqueous humor production. Little is, however, known about potential vasoconstrictor effects of brimonidine in the posterior pole of the eye. This is of clinical importance, because optic nerve head ischemia appears to contribute to glaucoma pathophysiology. Direct investigation of the ocular hemodynamic effects of brimonidine is, however, difficult, because lowering intraocular pressure with brimonidine may confound the results due to the concomitant change in ocular perfusion pressure.