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These days, there are various types of artificial tears.
Disposable artificial tears are really only used once and then discarded. However, these days, they don't even have separate caps, making storage difficult.
Do you really just tear it open once, use it, and then throw it away?
How long is it safe to use multi-use artificial tears that contain preservatives?
Because of the convenience of use, I use multiple doses of artificial tears frequently.
There are also stories that artificial tears without preservatives can only be purchased with a prescription from the hospital.