I have been using hemp seed oil for about a month now.
You can pick it up at most natural food or health stores. I have not used eye drops once since using hemp oil. It's proven omega 3, 6, 9 are extremely beneficial for your entire body. I consume 2 tablespoons a day orally, then I put one drop on my fingers before going to bed and rub it on my eyes, its a little un-comfortable but eyes are always pearly white. Doesn't matter how much you smoke. It is very good alternative to eye drops.
That's my review and input on Hemp seed oil. P.S. Nutiva is a good brand to look into.