Well, I did tons of research
. When I first had these symptoms I thought it was due to allergies, but it was getting worse and at some point my eye was very red and irritated. It struck me that my symptoms were similar to those reported by other ANers, post surgery, although I didn't have surgery and my eye was closing normally. I posted the question to the Cyberknife forum, were the good doctors gave me the hint. Also some fellow ANers suggested some eye drops that did provide some relief. I then decided to go see my optometrist (would take months to get a referral for an opthalmologist here), and he confirmed that the trigeminal nerve (nerve V) is responsible for sensation to the cornea, and given the absence of sensation, the tear production is affected.
Apart from the dry eye, do you have any other symptoms? Typically if the trigeminal nerve is affected by the AN you should be experiencing some reduced sensation on your face (could be different areas) and/or a feeling like your tongue has been "burned". These were the symptoms that actually led me to the discovery of the AN.
MK