The invention concerns a method comprising the steps of:a) illuminating a pupil (30) of the (3) eye of a subject by means of a light source (12)；b) acquiring at least one picture of said pupil comprising an image of the reflection of said light source on the retina of said eye, by means of an image-capture apparatus (10)；c) determining a refraction feature of said eye from at least a geometrical feature, a positional feature, or an intensity distribution of said image of the reflection of said light sourcewherein optical distances (dsource, dcam) between said pupil and, respectively, said light source and said image-capture apparatus, are different.An associated device (8) is also described.
