Re: Peters et al.: Threat to fixation at diagnosis and lifetime risk of visual impairment in open-angle glaucoma (Ophthalmology 2015;122:1034-9)

We read with interest the article titled “Threat to fixation at diagnosis and lifetime risk of visual impairment in open-angle glaucoma” by Peters et al.1 In a retrospective study, they evaluated the association between threat to fixation (TTF) at diagnosis and low vision and blindness in a group of glaucoma patients with whom they followed up until death. They found TTF was not an independent risk factor for developing glaucoma blindness or low vision when the disease severity stage (expressed in terms of mean deviation) at the time of diagnosis was accounted for.