A bi-ocular optoelectronic apparatus for screening for defects in the sight of and for measuring the visual acuity of a user, the bi-ocular optoelectronic apparatus including: - a housing having a first right aperture and a first left aperture, which apertures are respectively intended to be placed facing the right eye and the left eye of the user facing in a first direction of sight; characterized in that the bi-ocular optoelectronic apparatus includes: - a touchscreen comprising a first zone and a second zone that are spatially separate, - the touchscreen being placed in the bi-ocular optoelectronic apparatus so that the first zone of the touchscreen is in the interior of the housing and so that the second zone of the touchscreen is accessible from the exterior of the housing; - electronic means suitable for displaying a plurality of optotypes in a first portion (310, 301, 302) of the first zone of the touchscreen, internal to the housing; - an optical system (41, 42, 43, 44, 45, 46, 47, 48) placed in the interior of the housing, the optical system (41, 42, 43, 44, 45, 46, 47, 48) being configured to form a first right image of the first portion (310, 301, 302) of the first zone of the touchscreen in the direction of the first right aperture at a first vision distance following a first optical path, and the optical system (41, 42, 43, 44, 45, 46, 47, 48) being configured to form a first left image of the first portion (310, 301, 302) of the first zone of the touchscreen in the direction of the first left aperture at said first vision distance following a second optical path, characterized in that - the housing includes an opaque external wall that is placed transversely to the surface of the touchscreen so as to separate physically and optically the first zone from the second zone. - a housing having a first right aperture and a first left aperture, which apertures are respectively intended to be placed facing the right eye and the left eye of the user facing in a first direction of sight; characterized in that the bi-ocular optoelectronic apparatus includes: - a touchscreen comprising a first zone and a second zone that are spatially separate, - the touchscreen being placed in the bi-ocular optoelectronic apparatus so that the first zone of the touchscreen is in the interior of the housing and so that the second zone of the touchscreen is accessible from the exterior of the housing; - electronic means suitable for displaying a plurality of optotypes in a first portion (310, 301, 302) of the first zone of the touchscreen, internal to the housing; - an optical system (41, 42, 43, 44, 45, 46, 47, 48) placed in the interior of the housing, the optical system (41, 42, 43, 44, 45, 46, 47, 48) being configured to form a first right image of the first portion (310, 301, 302) of the first zone of the touchscreen in the direction of the first right aperture at a first vision distance following a first optical path, and the optical system (41, 42, 43, 44, 45, 46, 47, 48) being configured to form a first left image of the first portion (310, 301, 302) of the first zone of the touchscreen in the direction of the first left aperture at said first vision distance following a second optical path, - the housing includes an opaque external wall that is placed transversely to the surface of the touchscreen so as to separate physically and optically the first zone from the second zone.