Why do i have Double vision after squint surgery?

had Squint surgery 3 month ago 4 extropia Strabismes in both eyes. Im 18 never had double vision before the operation but i got it now i see to separate objects in nearly every direction i look. I have binocular double vision. I asked my optrom if i could get glass's or eye therapy but he said i couldent. Its illegal 4 me 2 drive with my condition. My twin sister got the same side effect that was said to be rare. Can slight autism be affecting recovery?

Thankyou to the 2 optromist that replied i am immensely grateful for your contribution and I feel your help was much more indeph than my own optromists offered. I can't picture driving with an eye patch i would be mortified at the prospect of using one eye! but the other methods sound very suitable for me. Thankyou!

Yagman's points are all valid and I support them.

The autism shouldn't be an issue.
(I have a formal diagnosis of Asperger's syndrome, so I'm reasonably up on this)

At 18, with a squint, your eyes and brain will have made some coping adjustments, otherwise you would have had double vision all the time *before* the surgery.
Depending on the type and degree of squint, this can involve more than the brain simply learning to switch the central vision of one eye off.
Sometimes a slight degree of binocular vision can be retained by the brain "reprogramming" (Loose term, but it will do) the retina of one eye. The formal name is "Harmonious Abnormal Retinal Correspondence" HARC.
But this set-up will have been disturbed when the angle of squint was changed, even if it was for the better.
If present, this too can lead to diplopia after surgery since, as far as the brain-adjusted retina is concerned, images in one eye are now off to one side.

There is some chance, at your age, that the brain will re-introduce suppression or re-set HARC to eliminate the diplopia IF this is the cause. If there is induced rotatory deviation, then further surgery may be considered once your eyes are fullly healed and can be reassessed.

Otherwise, as Yagman has said, some form of occluder in front of one eye may be the most practical route to deal with the diplopia. It may not need to be a complete frosting or a black patch: there are various less drastic treatments with better cosmetic effect (provided they work on the diplopia: this is a case-by-case thing). Occluding contact lenses also exist and are occasionally the best and most cosmetically acceptable route.

Optometrist, retired.

Each eye has six different extraocular muscles that control the directional pointing of each eye. Generally speaking if the cause of your eye turn is related to one of the rectus muscles (they turn the eye inward, outward, downward, or upward) then you it should be possible to compensate for the eye turn with prismatic glasses and stop the double vision. If your eye turn is now related to a rotation of the eye (which tends to occur more with the superior or inferior oblique muscles) then it will not be possible to deal with the double vision with glasses. Eyeglasses can only resolve double vision associated with lateral or vertical deviations -- not rotational deviations. If you are unable to see single again by either repeat surgery or eyeglasses it is still possible for you to drive. You can have your eye doctor prescribe eyeglasses that have the optics "frosted" to allow light in but to obscure detail. This will stop your double vision. Having only one functional eye will not prevent you from driving legally. Hopefully, though, a repeat surgery will be able to stop your double vision. Hope this helped.

Added: What Pedestal said is definitely true. Just didn't know whether to take all the time needed to fully explain this issue and it's pretty complicated to explain. As to the contact thing, if you end up with a need to occlude for a prolonged period of time then definitely look into the contact. My suggestion as to the glasses would be a good idea if your surgeon plans to operate soon in an attempt to put you back the way you were.