@jimhd My eyes don't converge perfectly either, but that is only an issue at very close ranges for me. Each eye sees a different angle of the view because of the distance between your eyes, and you can see the difference by covering each eye independently and comparing. The brain puts these two different visual images together in the visual cortex to create 3 dimensional vision with depth perception. The movement of each eye ball is controlled by several small strap like muscles attached to it that move it different directions and serviced mainly by the occulomotor nerve. If there is a problem with the nerve and it doesn't communicate correctly with the muscles, that affects the ability to physically move the eye correctly. That's a simple explanation of how it works. I hope your opthalmologist can find a resolution for you. I used to wear contacts where one eye was corrected for distance and the other for close vision. I'm nearsighted. What I found was that the distance eye became the dominant one and I wouldn't see the image from the close eye unless I focused on something closer. I don't know if that would work now because my eyes have changed as I've gotten older, and I am less near sighted now.