Anterior ischemic optic neuropathy and increased intraocular pressure.

Five patients were noted to have increased intraocular pressure (IOP) during evaluation for acute nonarteritic anterior ischemic optic neuropathy (AION). Three of the five had no prior record of IOP elevation; all five had small cup-to-disc ratios. Elevated IOP may be a risk factor for developing AION, especially in eyes with structurally congested optic discs.