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kammerer Are you stating that based on fact or assumption?
To answer this as a question from a somewhat reputable source:
https://www.aao.org/eye-health/treatments/lubricating-eye-drops
Are Lubricating Eye Drops Safe?
Lubricating eye drops are generally safe to use as often as you need them if they do not have preservatives. Eye drops with preservatives have chemicals that are designed to keep bacteria from growing in the bottles once they are opened.
Artificial tears can have side effects, such as blurry vision. It is also possible to have an allergic reaction to the medication. Symptoms can include itchiness, swelling, breathing problems, feeling dizzy, or feeling sick. If you see any symptoms like this, stop using the eye drops and see a doctor right away.