If I followed this right: 1) Some external/biological problem (dry eyes) triggers the nerves to send pain signals to the brain. 2) Due to long-term external/b

If I followed this right: 1) Some external/biological problem (dry eyes) triggers the nerves to send pain signals to the brain. 2) Due to long-term external/biological problem the nerves become conditioned to send pain signals 3) Even when the external/biological problem is solved, the nerves can stay "latched" in a position of sending pain signals. There is currently no cure for this problem. That's pretty scary stuff.