1. A method for establishing refraction of an eye ( 9 ) by means of a refractometer ( 3 ), comprising: establishing the current visual axis (S) of the eye ( 9 ) before establishing the refraction; aligning the refractometer ( 3 ) with respect to the visual axis (S) of the eye ( 9 ) and establishing the refraction after the alignment, wherein the visual axis (S) of the eye ( 9 ) is established on the basis of the position of a Purkinje image of at least one light source ( 41 , 50 ) used to illuminate the eye and a relationship between the position of the Purkinje image and the visual axis (S).