Latisse for dry eyes?

You are not
recommended to start using Latisse® while you have blepharitis. This is because
blepharitis restricts eyelash growth, limiting the potential effects of
Latisse®. The product may also further irritate your eyelids. If you’re
currently using Restasis, you should be on track to healthy eyes. Many patients
are able to resolve their blepharitis after about 3 months of Restasis. If
you’re still interested in the benefits of Latisse® once your blepharitis has
healed, you can begin use after you speak with your physician.

Latisse is placed on the lash line and not into the eye.   Latisse shouldn't cause a problem with your use of Restasis for dry eye symptoms. 

Latisse and Restasis are both Allergan products and they do promote them together so they are fine to use. Latisse only goes on the upper lids, not in the eyes, so it should not affect your dryness. "This answer has been solicited without seeing this patient and cannot
be held as true medical advice, but only opinion. Seek in-person
treatment with a trained medical professional for appropriate care."