During the last few years, studies regarding the etiology of open-angle (chronic) glaucoma (OAG) have led to the identification of several risk factors, divided into high, moderate, and low. Until recently, stress has been considered of little importance, although several studies1–6 have reported that an increase in the intraocular pressure (IOP) occurs during conditions of physical or mental stress, both in healthy subjects and in those affected by OAG.