Gladys, this is the link to Knighton optical in Salt Lake City, Utah, USA. You could email them and see if they could be of some help. This is the only place that I know of that makes the FL-41 tint to put on glasses.
I'm sorry that your botox has still not given you much relief. Sometimes, it takes several tries to get the right dosage and sites. Sometimes, you have to try another doctor. Let us know how you are doing and continue to ask questions. We will help you anyway that we can.
Shirley in AR.