A hand-operated, non-powered ophthalmic device intended to temporarily prevent and/or attenuate the passage of light (vision) to the eye(s) during an eyesight examination (e.g., diagnosis/measurement of heterophoria/heterotropia, myopia). The part of the device used to cover the eye(s) is typically spoon- or oval-shaped, and may be fully opaque or incorporate small holes and/or a Maddox lens(es) [i.e., coloured lens(es)]; the device also incorporates a handle and/or binocular frame. This is a reusable device.