Method for jointly determining accommodation and vergence of at least one eye (112, 112') of a user, wherein the method comprises the following steps: a) presenting at least one symbol at at least one first distance in front of at least one eye (112, 112') of a user for stimulating the accommodation of the at least one eye (112, 112'); b) registering at least one eye movement of the at least one eye (112, 112'); and c) ascertaining a refraction of the at least one eye (112, 112') with the accommodation of the at least one eye (112, 112') at the at least one first distance; d) jointly determining the accommodation and the vergence of the at least one eye (112, 112') by o ascertaining a change in the refraction of the at least one eye (112, 112') with the accommodation of the at least one eye (112, 112') at the at least one first distance in relation to the accommodation of the at least one eye (112, 112') at at least one second distance; and o ascertaining the vergence of the at least one eye (112, 112') from the at least one eye movement of the at least one eye (112, 112') with the accommodation of the at least one eye (112, 112') at the at least one first distance; characterized in that the refraction of the at least one eye (112, 112') is ascertained by registering the at least one eye movement of the at least one eye (112, 112') on the basis of the at least one symbol while a parameter of the at least one symbol is altered, wherein a point in time is determined at which a recognition threshold of the user for the at least one symbol emerges from the at least one eye movement, wherein the refraction of the at least one eye (112, 112') is ascertained from the parameter for the at least one symbol defined at this point in time. a) presenting at least one symbol at at least one first distance in front of at least one eye (112, 112') of a user for stimulating the accommodation of the at least one eye (112, 112'); b) registering at least one eye movement of the at least one eye (112, 112'); and c) ascertaining a refraction of the at least one eye (112, 112') with the accommodation of the at least one eye (112, 112') at the at least one first distance; d) jointly determining the accommodation and the vergence of the at least one eye (112, 112') by o ascertaining a change in the refraction of the at least one eye (112, 112') with the accommodation of the at least one eye (112, 112') at the at least one first distance in relation to the accommodation of the at least one eye (112, 112') at at least one second distance; and o ascertaining the vergence of the at least one eye (112, 112') from the at least one eye movement of the at least one eye (112, 112') with the accommodation of the at least one eye (112, 112') at the at least one first distance; o ascertaining a change in the refraction of the at least one eye (112, 112') with the accommodation of the at least one eye (112, 112') at the at least one first distance in relation to the accommodation of the at least one eye (112, 112') at at least one second distance; and o ascertaining the vergence of the at least one eye (112, 112') from the at least one eye movement of the at least one eye (112, 112') with the accommodation of the at least one eye (112, 112') at the at least one first distance;