I Knew Our Parents Were Lying! (page 4)
Crossing your eyes will make you go cross-eyed
This is another bizarre statement that has struck fear into many children over the years, but crossing your eyes is one activity which cannot become permanent. The fact is that, as with the previous entry, the muscles that hold the eye in place keep it in a certain position. If you then contract some of those muscles to go cross-eyed, eventually they will fatigue, and the eye will return to its original position. The wind changing (another common myth) also has no bearing on this scenario. This claim can probably be attributed to parents who don’t want their kids making faces in public.