My mother who started working in a library about six years ago developed a tick in her left eye and we wondered if the lighting was to blame, well she retired three months ago and her eye tick has all but stopped. It's went from ticking every few seconds to maybe once or twice an hour. She developed the tick within a month of starting there, so who knows but it does seem that it might have had something to do with it. Previously she had never worked under fluorescent lighting.
