Strabismus: abnormal eye alignment, cross eyes. Intermittent or Constant
Usually occur in infants as their brains learn to control both eyes simultaneously.
Intermittent Strabismus could happen in some adult (like me) when eyes get tired.
4 Sub terms - one eye in the middle while the other not:
1. Esotropia (Most popular, when the other eye points to the steady eye - converged vision)
2. Exotropia (when the other eye points away - diverged vision)
3. Hypotropia (when the other eye points downward)
4. Hypertropia (when the other eye points upward)
My case is esotropia, happens when my eyes are tired, at which time I could control the movement of eyes. It is harder to do esotropia at waking state. Although, it can be done by identifying which eye is responsible for which vision during double vision (cross eye-converged vision, or diverged vision)
I have thought my case is related to myopia. Since having to converge vision in shorter distance, the muscle may have strained inwardly, causing esotropia when tired (not aware).
Another interesting note is my left eye would always stay while the right eye is the moving one. It would be harder to switch roles.
I wonder if this is due to my right eye being more nearsighted.
I am also wondering if I'm having strabismus during deep sleep.
I would think it may have been caused by force awake during tired moments, making the eyes begin to sleep while eye lids were still open, when the brain probably has no strength to control the eyes. If this is true, it would be a habitual case.