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There should not be any side effects to using artificial tears. When using the tears with contact lenses, you should get the re-wetting drops made specifically for contact lenses.
Infections due to contact lenses usually has symptoms of pain, blurred vision, and light sensitivity.
If you are seeing your ophthalmologist, it is best to wear the contact lenses so he can see how they fit. If you feel you have an infection, however, you should discontinue use right away and contact your eye doctor.