Eye-tracking is actually rarely what you really want. The problem is that it tends to cause severe eye strain in a short amount of time as you manually take con

Eye-tracking is actually rarely what you really want. The problem is that it tends to cause severe eye strain in a short amount of time as you manually take control of your eyes and overtense your muscles. Try visually typing out a sentence on a keyboard by looking at the keys in sequence as a demonstration. Your eyes naturally will want to be imprecise and move away from the points you care about, which will cause you to fight the tendency to saccade, creating both visual disturbances and muscle fatigue. Eyes are meant for looking, not pointing. :-)