1 doctor weighed in:

Is there a difference between artificial tears in a bottle vs. single use vials?

1 doctor weighed in
Dr. Robert Kwok
Pediatrics

In brief: Preservative-free

Usually, eyedrops in a bottle are meant for multiple doses, and have a preservative to prevent germs from growing in the bottle after the bottle is opened.
Single-use vials are meant for only one dose (one use), and do not need preservatives because they are expected to be thrown away after being opened.

In brief: Preservative-free

Usually, eyedrops in a bottle are meant for multiple doses, and have a preservative to prevent germs from growing in the bottle after the bottle is opened.
Single-use vials are meant for only one dose (one use), and do not need preservatives because they are expected to be thrown away after being opened.
Dr. Robert Kwok
Dr. Robert Kwok
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