The artifact of retinoscopy.
D000818:Animals; D005133:Eye Movements; D007909:Lenses; D008297:Male; D009039:Motion Perception / Q000502:physiology; D009799:Ocular Physiological Phenomena; D055095:Optics and Photonics; D011817:Rabbits / Q000502:physiology; D012029:Refraction, Ocular