"Pure" and "legit" are not the same thing. LSD is ridiculously potent, and doses are in micrograms. LSD in liquid form is virtually always heavily diluted in solution - not because it's "bad" or "cut" but because that's how transporting highly potent drugs in solution is always done. A single drop of 100% pure LSD would be a very, very high dose - remember, doses are measured in *micrograms*. The majority of even very potent 'liquid LSD' is made up of solvents like alcohol or water. Again, not because you're getting ripped off, but because that's what liquid LSD generally *is* supposed to be - LSD in solution. If you were getting actual 100% pure LSD with no solvents involved, you would know. Product like that isn't gonna make it far from the original source before being laid on tabs or put into solution, in general.
Individual doses of LSD can vary a ton in subjective experience. The fact that your friend took 2 orally and you tripped harder doesn't mean the eyedrop crap helps at all. It doesn't. The LSD absorbs into the blood vessels around the eye, just like it would absorb into the blood vessels under the tongue if you dosed sublingually. Once it's entered your bloodstream, it doesn't matter in the slightest what route it took to get there. The ONLY difference between dropping it in your eye and dropping it under your tongue is that the eye method *might* make you come up a little quicker, but the actual peak levels of LSD in your system won't be any higher.
If you do this with the wrong solvent mix, YOU COULD PERMANENTLY BLIND YOURSELF. In less extreme cases, it's not at all unlikely that there could be alcohol in the solution which would burn like hell. All that for what basically amounts to a placebo.