Are you certain that eye is actually dialated or is the opposite one actually very constricted?the only reason i ask is this is what mine are since my surgery done on my spinal cord caused sympathetic nervous system damage.the condition is called horners syndrome.one eye is always constricted and the lid is usually a bit drooped looking as well.anytime you have a surgery done on the spine the SNS is vulnerable to getting some level of damage.in the neck it is just more likely becasue there are more SNS innervated fibers in there along with the stellate gangion too.it is just a much more highly innervated area than any other part of your entire column too.how are your eyes as far as reacting to light?the 'horners' affected eye,inmost cases,will not react at all,it stays constricted at all times.does the dialated appearing eye get bigger and smaller when exposed to light and then it is taken away?really check both eyes further to see just what eye is actually doing what.try looking up horners sysndrome and see just how your actual symptoms compare.marcia