Hi Shez,
After I had my Right temporal lobectomy my vision got really bad I found out that what can cause it is a lesion in the brain if the right side is worse then you may have a lesion on the left side of your brain. Also your opticcal lobe where your eyesight is may be affected from the surgery. You should let your neuro know about this and they can do visual field testing on you to find out what's going on. I had to have this type of testing done before and after my surgery.
TBI can also cause poor vision along with any AED's you take I know that when I was on tegretol my eyesight got really bad. I wish you only the best and May God Bless You!

Sue