Technically speaking, strabismus, or crossed eyes, is a condition when one or both eyes turns in or out, up or down. As a result, , eyes do not look at the same place at the same time, commonly resulting from the failure of the brain to coordinate both eyes simultaneously. As for the double vision, it usually causes by independent individual work of each eye. The poor eye muscle control or a high amount of farsightedness can attribute to this symptoms. I mean, each eye creats its own, faintly different image. And if you let things slide when you suffer the crossed eyes, the eye muscles may damaged, or even the nerves, the muscles may not be able to control the eyes correctly, resulting in double vision. The major control center of vision is our brain. So it has the possibility for those with crossed eyes to see double vision. See your doctor and he can give you more details.