###Human: What is the reason for having double vision and is it preventable? ###Assistant: Hi. It seems that you have phoria (not strabismus) and the fatigue in eye muscle cause double vision. I advise you to decrease the effort. Take good time to rest and use vitamin B (1,6,12) and keep your vision good (always about 20/20) by glasses or without any problem in your vision. For more information consult an eye care ophthalmologist online -->