Re: How do I know if I 'graduated'?

Well, since I have to do this all the time (for how long??) because of all my medical issues (glaucoma, cataracts..), I was wondering if it would also be more ECONOMICAL, too?

I mean, if I only need..say..two or 3 drops of DrS formula versus 9 drops of DrC formula, then it should last three times longer, right? Or run out less often?
I'm going through the stuff rather quickly, and quite honestly NONE of it is in the budget, no matter WHAT I'm doing, so I'm just trying to find a way to be able to keep up the regimen.