I am so sorry to tell you that there is no easy way to protect your remaining vision. But you can do some work to your eyeglasses prescription. I have heard that a kind of lens called prism can make that. Or you can also go to an eye doctor to aski for some kind of eye drops. Remember to use this kind of eye drops under the guidance of a professional eye doctor or you may get your situation worse. Besides, if it is convenient for you, you might as well try some specific vision therapy . I heard that it was very effective. By the way, you had better not drive any more coz it may be dangerous for you.