Recently, after a very long day (about 20 hrs.), I began to notice that my
vision was similar to that when I am cross-eyed. After resting sufficiently, I am still having the same problem 2 days later. The best that I can see in the mirror is that 1 eye is not always moving as quickly as the other, but a lazy eye doesn't seem to be realistically caused by fatigue. Otherwise, my eyes do not visually appear to be crossed; but my vision comes off as such.