Visual Disorder Atlas vs vHIT96da

There are many kinds of visual symptoms. Some are quite harmless while others need to be taken seriously. Correct interpretation depends on good descriptions but putting foreign sensations into words is often difficult. The Visual Disorder Atlas pictorial library aims to assist and complement verbal descriptions by providing 40+ symptomimetic illustrations. Most illustrations are interactive and animated. One and the same symptom may have numerous causes. Therefore, Visual Disorder Atlas cannot make diagnoses on its own. What the app can do is to facilitate precise communication with medical experts. The app can also serve an educational role, by providing a comprehensive overview over visual symptoms. Visual Disorder Atlas was compiled by Professor Lars Frisén, MD, at the University of Gothenburg, Sweden, and builds on thousands of descriptions provided by real patients.

This application enables video head impulse testing (vHIT) using an iPhone. A dedicated fixation device is attached to the iPhone and held in place by the subject biting on the mouthpiece. The 3D design data for this fixation device are available on the developer’s website. The application records eye movements using high-speed video capture and analyzes the recorded video to generate graphs of eye movement. Simultaneously, motion sensor data from the iPhone are acquired and used to generate graphs of head movement. The analysis results can be saved as image files. These saved images can also be attached to and sent via email. This application and fixation device have been used in research studies approved by an institutional ethics committee in Japan. They are intended for research purposes only and must not be used for clinical diagnosis or treatment.