I was skeptical at first about careprost, since it is a 'knock off' Latisse and name brands always hold more clout. Despite this, I purchased 2 bottles of careprost at 11$ each from alldaychemist.com. I've been using it since the end of October, every night applying it to my eyelashes & eyebrows. My method is to put 1 drop into the well in the top of the bottle & then use the very handy eyeliner brush that comes with it to apply. I only use 1 big drop for both eyelids & the ends of my brows. It seems plenty enough, a drop per eyelid would be way too much. During the first few weeks, I noticed a darkening [purple-ish] line above my eyelashes & experienced some itching. Nothing horrific & I no longer experience it. As to iris pigmentation, mine eyes are still green, no change. I'm very careful not to get the product into my eyes, only onto the skin of the eyelid, sometimes I don't even try to get extremely close to the lash line, just within the vicinity. I employ a magnified mirror to help precise application.
My lashes before were ok, not awful, not praise worthy and asymmetrical. I noticed results after 6 weeks - my lashes were much longer than before & look splendid with mascara. They touch the curve beneath my brow when they are curled & mascaraed. I'm currently at 8 weeks I would guesstimate & can't wait to see how they'll look in another 8 weeks. They were always stick straight before, but I think I'm noticing a slight curl to them now. I would die of joy if they curled on their own like I hear some people experience. I definitely recommend this product; it feels like such a luxury having enviable lashes at such a cheap price. I will be repurchasing this product always.