So, after researching this, I still don’t have a perfect number. The real answer is: it depends on the bottle, the liquid, the room temperature, and how cranky you are that morning. A cold drop is smaller than a warm one, by the way. Science is cruel.
You can do a fun (and slightly sad) experiment at home. Take an empty eye drop bottle, fill it with exactly 1 ml of water using a syringe, then count the drops as you squeeze them out. You’ll get a number that is unique to you and your bottle. Congratulations, you are now a statistical outlier.
The Final Squeeze
In the end, don’t obsess over the exact count. If your eye drops are working, great. If they run out faster than expected, it’s probably not your imagination—it’s physics messing with you. Just remember to store the bottle upright and don’t let the tip touch your eye (that just invites bacteria to the party).
So, how many drops per ml? Somewhere between “not enough” and “stop squeezing so hard.” And if you accidentally waste a drop on your cheek? Just call it a tiny, expensive facial moisturizer. Your face is hydrated. Your bank account is not. Welcome to the club.
