System for determining refraction features of both first and second eyes of a subject , the system comprising: - a light field display device having a referential in three-dimensions; - a system of localisation of the positions of the first and second eyes of the subject viewing said light field display device , relatively to the referential; - a control unit to drive the light field display device ; - the light field display device being configured to generate a first light field directed selectively toward the first eye of the subject , said first light field being adapted to form a first image on the first eye of the subject , the control unit being adapted to adjust said first light field as a function of at least a first refraction parameter associated with at least a first optical aberration for said first eye so that said first image is perceived corrected for a first adjusted value of said first refraction parameter by the first eye, the control unit being adapted to determine a refraction feature of the first eye from the first adjusted value of said first refraction parameter and wherein the light field display device is configured to generate a second light field directed selectively toward the second eye of the subject , said second light field being adapted to form a second image on said second eye of the subject , the control unit being adapted to adjust said second light field as a function of at least a second refraction parameter associated with at least a second optical aberration for the second eye so that the second image is perceived corrected for a second adjusted value of said second refraction parameter by the second eye, the control unit being adapted to determine a refraction feature of the second eye from the second adjusted value of said second refraction parameter. - a light field display device having a referential in three-dimensions; - a system of localisation of the positions of the first and second eyes of the subject viewing said light field display device , relatively to the referential; - a control unit to drive the light field display device ; - the light field display device being configured to generate a first light field directed selectively toward the first eye of the subject , said first light field being adapted to form a first image on the first eye of the subject , the control unit being adapted to adjust said first light field as a function of at least a first refraction parameter associated with at least a first optical aberration for said first eye so that said first image is perceived corrected for a first adjusted value of said first refraction parameter by the first eye, the control unit being adapted to determine a refraction feature of the first eye from the first adjusted value of said first refraction parameter and wherein the light field display device is configured to generate a second light field directed selectively toward the second eye of the subject , said second light field being adapted to form a second image on said second eye of the subject , the control unit being adapted to adjust said second light field as a function of at least a second refraction parameter associated with at least a second optical aberration for the second eye so that the second image is perceived corrected for a second adjusted value of said second refraction parameter by the second eye, the control unit being adapted to determine a refraction feature of the second eye from the second adjusted value of said second refraction parameter. <EOS>