Postural control and binocular anomalies

Abstract

AbstractVergence insufficiency is an extraocular dysfunction screened regularly by ophthalmologists and orthoptists. Incidence increases with screen and computer work, resulting in visual quality and quality of life loss. Clinical diagnosis is based on associated well‐defined criteria (Alvarez 2010, Horwood 2014). Quantification of symptoms reported (Echelle CISS), evaluation of response to disparity stimuli and accommodation in natural spaces, calculation of ratio accommodation/vergence and measure of static performance. These criteria are essentially subjective and break the natural bond of two synergistic systems: convergence and accommodation. In the literature very few studies objectify dysfunction with video‐oculography because most authors induce either angular disparities by artificial haploscopic devices or defocusing. However, restricting the visual examination to each component, the vergence of the one part, and on the other hand accommodation, this analytical fragmentation is not representative of the daily behavior of patients. Indeed, in the natural space simultaneous variations of angles of disparity and focus stimulate and maintain synergy vergence‐accommodation. Therefore, we propose an ecological study of the vergence system by stimulating real space. In the meantime our daily actions seek simultaneously vergence and saccadic eye movements, we also extend the study to the combined movement.