Sorry, I'm from China and I can't really understand all the things here. I got DES from lasik. I think I can manage most of my life. However, recently my right eye was crushed, and the BUT test result got down to 2 seconds although the doctor told me that damage from crushing usually had nothing to do with dry eye. Now my right eye was so painful that I was unable to function. I was considering the sclerals. I wonder if it's only available in the US and can it increase BUT.