Use a few drops of eye drops each time. 1) One drop: 17%; 2) Two drops: 50%; 3) Uncertain: 33%. Expert Commentary: One to two drops of eye drops at a time is sufficient. More than that not only won't be absorbed but may also cause adverse reactions. One drop of eye drops is approximately 30 microliters, while the conjunctival sac can normally only hold about 7 microliters. Even with more eye drops, the conjunctival sac's capacity can only increase to a maximum of 30 microliters. Excess eye drops will either overflow from the corner of the eye or flow into the nasal cavity along the nasolacrimal duct. For eye drops without toxic side effects or irritation, using a few extra drops is simply wasteful.
Eye Drop Ingredients: 10%; 2) Advertising: 7%; 3) Doctor's Recommendation: 30%; 4) Pharmacy Staff Recommendation: 3%; 5) Personal or Friend's Experience: 50%. Expert Commentary: Although many eye drops can be chosen independently, it's best to have an ophthalmologist examine you before purchasing eye drops to determine your specific condition and then buy according to the doctor's advice. If you must choose this method, you must carefully read the instructions. If you experience any discomfort during use, see a doctor immediately.