APA Dictionary of Psychology

the pressure inside the eye, as measured by tonometry. Increased IOP may indicate glaucoma, a disease in which the pressure inside the eye increases to the point at which it causes impaired vision and eventually blindness if untreated. The use of drugs with anticholinergic effects (e.g., tricyclic antidepressants, antihistamines, sympathomimetics) may raise IOP in patients with acute glaucoma, potentially requiring immediate medical intervention to preserve sight.