a vision optional second be emitted before it can reflect off of a bottom
magnifying_glass is not vision_aid. reflected_illumination is indirect_illumination. auditory_perception is not perception. reflected_illumination is not indirect_illumination. stoplight is visual_signal. stoplight is not visual_signal. use_glasses_if_vision is not not_20_20. use_glasses_if_vision is not_20_20. central_vision is sight. central_vision is not sight.