The 3rd day, I went to put in my hard contacts, they were very painful and I couldn't wear them. I wore my glasses to the optometrist and asked him to do a quick exam to check my vision even though I had been there just a few days before for my yearly exam.
Surprisingly the exam showed my eyes had changed enough so the new contacts that I had paid for were not going to be useable. So I wore my glasses for another week, and I could tell they were not working good after a few days, so I then went back for another exam which showed even more changes. Soft contacts were my only option, and now in the end of January 2020, I have new contacts every 2-3 weeks due to my eyes vision improving that quickly due to the X39 patch.
I should mention that my vision has been impaired since birth probably as when I went to first grade I could not see the black board from the front row and was put into thick glasses until at age 12, my eyesight was changing so rapidly, they said I would be blind in 10 years or so if I didn't start to wear hard contacts. So, I did start them at age 12, and they never changed until the X39 had its effect on my Stem Cells !
I have used all the other patches now for 15 years as they have been released and none of the other patches have affected by eyesight.