fatigue shows an increasing trend. One of such
devices is visual fatigue questionnaire [12-15]. The
other device assessing variations of visual fatigue
objectively is VFM-90.1 designed based on Flicker
Value variations. Flicker Value is based on the
critical fusion frequency (CCF) [16-17]. Flicker
value index measures the eye’s retina’s accuracy
and function which has a high sensitivity and easy
application [12]. Visual performance and
personnel’s accuracy show a reverse relationship
with their visual fatigue [11]. Thus, with
diagnosing the major visual fatigue symptoms and
determining the correlation of each of the main
domains of visual fatigue and its symptoms with
flicker value variations (as a physiological index),
it is possible to act properly in providing proper
strategies to prevent and control VDT user’s visual
fatigue. As a consequence human errors and
related accidents will be prevented. This study
aimed to find out a relationship between visual
fatigue symptoms (VFS) of Flicker value
variations in video display terminal (VDT)
operators.