No cure or specific treatment is available. I do suggest you see an ophthalmologist. Use the search feature and look for postings like yours. Other people have reported the same problem. Most, but not all, eventually recovered their previous vision
JCH MD
Hope that its not permanent. No way to clear the toxins from your system and eye.
Serious about getting this OK? Stop doing blow, meth, hash, heroin and all the illegal drugs that are so detrimental to your health and vision.
JCH MD