I honestly have no clue about that..... but if someone could promise me that Restasis would make my eyes better for the rest of my life, I would definitely not mind using it for another 60 or 70 years! That was probably me that mentioned the quality of the tear film. I have had all 4 ducts cauterized and I had a lot of luck with it... my eyes now have tears in them. But the tears don't really stay on my eyeballs because they lack the essential oils, so they roll right off. Have you tried taking any sort of oral nutritional supplements like flaxseed oil? I take Thera Tears Nutrition. It's supposed to help restore the essential oils in the tears. I also use Refresh Endura, which is also supposed to help with the quality of the tear film. So far neither my dr nor I see very much of a difference. But we have to give it time. I will certainly try to remember to ask him how long I would need to be on Restasis for, if it were ever to really start working.
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