Visual Training with a Prism (IMAGE) Saarland University Caption The picture shows a visual training with a prism. The patient wears Bagolini glasses. The therapist hold a prism in front of the patient's eyes to measure the fusion, i.e. the therapist wants to find out how the patient is able to fuse the two images into a single image. Credit Oliver Dietze Usage Restrictions The press photograph can be used at no charge. Please read and comply with the conditions of use (www.uni-saarland.de/pressefotos). License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.