Normal tension glaucoma--a practical approach.

Normal tension glaucoma (NTG) remains a diYcult diagnosis for the ophthalmologist who favours the argument that raised intraocular pressure (IOP) is essential for the diagnosis of primary open angle glaucoma (POAG). The concept of NTG challenges us to distinguish between pressure dependent and pressure independent causal factors. The purpose of this review is to present some of the current information on the epidemiology, aetiology, and management of NTG, based upon a review of recent literature and experience with more than 400 NTG patients attending the glaucoma service at Moorfields Eye Hospital.