In one aspect, a device includes a body, an arm, a camera, a support arm, an indicator support, and a plurality of indicators. The body is configured to mount to an eyeglass arm. The arm extends from the body. The camera is coupled to the arm and configured to capture images of at least one eye of a user. The support arm extends from the body. The indicator support is coupled to the support arm such that, when the body is mounted to the eyeglasses and the user is wearing the eyeglasses, the indicator support is positioned in the user's field of view. The plurality of indicators are coupled to the indicator support.