as the want of a vision water sun , the want of that vision water will decrease
magnifying_glass is not vision_aid. still_water is good_reflector_of_light. daylight_vision is not sight. still_water is not good_reflector_of_light. night_vision is not sight. light_water is not water. color_vision is not sight. whales has poor_vision wearing_eyeglasses has effect_of_improving_vision floodlight is not light.