I see you have some different questions here that I'll try to answer.
The eye wash does burn; it has cayenne in it. I am just going by what hubby says, I have not used it myself. He says the more consistently he uses it per day, the less burning he experiences. He says he noticed the feeling of less pressure within a couple of weeks. As far as using it in an eye that has had cataract surgery and lens implant, I do not know. I would like to know the answer to that one also, as I have had that surgery on one of my eyes.
BTW, hubby has had laser surgery for glaucoma on the eye he is NOT treating with HEB. The pressure is within the normal range in that eye. He is only treating the eye that has not had surgery. He says he WILL NOT consent to surgery on his eyes anymore.
Kee, I hope this helps.
God Bless you and yours,
Texcen