Long-term stimulation of residual function in patients with visual field defects after post-chiasmatic lesions

Visual Restoration Therapy (VRT) increases visual field size of an average of 4.9°-5.8° visual angle in patients with optic nerve or post-chiasmatic lesions suffering from visual field defects (Kasten et al., Nature med, 1998). So far, investigated patients had trained on a daily basis for a maximum of six months. In a retrospective study we evaluate, whether training sessions beyond 6-month had added further visual field enlargements in patients, who had extensive training for an additional six- month period. Visual field tests were assessed in 19 patients at 90° eccentricity using Rodenstock Perimat 206 (monoc…