If I followed this right:<p>1) Some external&#x2F;biological problem (dry eyes) triggers the nerves to send pain signals to the brain.<p>2) Due to long-term external&#x2F;biological problem the nerves become conditioned to send pain signals<p>3) Even when the external&#x2F;biological problem is solved, the nerves can stay &quot;latched&quot; in a position of sending pain signals. There is currently no cure for this problem.<p>That&#x27;s pretty scary stuff.