have anything wrong with your eyes that I should know about medically? Like do you have a glass eye or anything like that? >> No. >> No, not at all. Okay. >> Okay. Can you see the tip of my finger? >> Yes. >> Yes. Okay. So, what I want you to do is I want you to follow my finger with your eyes and your eyes only. And I don't want you to move your head. Do you understand? Okay. >> Okay. Stand up straight. Just keep your arms at your sides. Okay. Ready?