Answer Wiki. The system would be cued off the pilot's helmet, so it will definitely look where your head is pointing, not your eyes specifically (that would be a gaze-tracking system, which AFAIK hasn't yet been used for this kind of application).
Exercise to Gain Leg Weight. Although you can't make your body gain weight in your legs, you can perform exercises that encourage the growth of leg muscle. Squats, lunges and step-ups are examples of such moves that target the legs and recruit a lot of muscle fibers for growth.
Elevating your legs 6 to 12 inches higher than your heart whenever possible will also decrease swelling. If you have the chance to sit down during the day, use a foot stool or chair to make your legs at least even with your body. If this is not possible, then elevate your legs as soon as you get home.