I had it, or a newer version of it. I had pain before , which I considered to be a migraine, triggered by bad vision in one eye. But the vision was very close to perfect, one clinic refused to do it. After the procedure, and some amount of healing time the vision was perfect, but the pain came back and became stronger. So I suffered strong migraine like pain for years. Untill last month somebody here recommended NAC (N-acetyl-cysteine) supplement, I tried it and it worked within days. Turns out it was just dry eye. I did not make the connection, because eye drops did not help me, they seemed to make it worse. i was not missing in tears, but the eye lubricant which retains the tears on the surface, and multiple doctors missed it.