I don't know what type of allergy eye drops you wife is using, so I am not sure whether they will cause any issues with your baby. You should take the allergy eye drops to your doctor and ask him for advice. If they are not allowed, then don't use them any more.
First, you should try to relax, anxiety and stress are not good for the baby. There should be no big deal to use eye drops. If you are quite worried about this, go to the hospital and have an exam to make sure the baby is all right.