With left homonymous hemianopia what is my field of vision? and technically could i drive in washington state?

Unlikely: The loss of the left field (from each eye in your case) is the worst possible for driving as we drive in the usa on the right side of the road and most important hazards come from the left which is a blind spot for you. Wa state will measure your vision which might b e fine, and will do a test of whether you can see to the left which you will fail. Frankly you will be a hazard to all on the road.