Often, visual fatigue symptoms and computer
vision syndrome largely overlap [8]. In a study
carried out in 2007 to assess the visual fatigue of
telecommunication operators, the results revealed
that there was a close and significant relationship
between neck-shoulder pain and eye complaints
[9]. In a parallel study done in 2007-2008 in Yazd
Medical University on 105 people, results showed
that eye complaints among computer users include
visual fatigue (79%), eye burning (57.7%), tearing
(33.4%) and eye redness (30%). Besides, the
mentioned complaining revealed a significant
relationship with improper working conditions
[10]. In a study to assess computer user’s visual
function, the results showed that studying e-books
lead to higher eye complaints than studying books.
Moreover, visual function with studying books is
significantly better than studying e- books [11].
Providing and promoting devices assessing visual