Hi Chunksmama,
I believe you mentioned that Chunk will be having surgery(neutered) soon. I realize you are still unsure if Chunk has "dry eye" but if he does it is important for the vet or the vet techs to administer eye drops prior or during surgery to keep the eyes lubricated.
It may be worth it to ask them to put drops in so he is more comfortable when he wakes up. I read an article about this and I can't seem to find it to share with you--but I'l keep looking.
I hope Chunk's eye is feeling better. Lucy sends a big hug and kiss.