Extract:

People diagnosed with CFS/ME consistently report that they experience vision-related symptoms associated with their illness and some of these reports are being verified experimentally.  Although vision-related symptoms may represent a significant clinical feature of CFS/ME that could be useful in its diagnosis, they have yet to be included in clinical guidelines.

A recently developed, standardised measure designed to assess core CFS/ME symptoms, The DePaul Symptom Questionnaire (DSQ),5 includes four vision-related items…

Vision-related symptoms as a clinical feature of chronic fatigue syndrome/myalgic encephalomyelitis? Evidence from the DePaul Symptom Questionnaire, by Claire V Hutchinson, John Maltby, Stephen P Badham, Leonard A Jason, in British Journal of Opthalmology, 1 November 2013