الفهرس 
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Abstract
There is growing body of evidence that usage of computers can
adversely affect the visual health. Considering the rising number of
computer users in Egypt, computer-related visual symptoms might take
an epidemic form. In view of that, this study was undertaken to find out
the magnitude of the visual problems in computer operators and its
relationship with various personal and workplace factors. Aim: To evaluate the probable effects of exposure to electromagnetic
waves radiated from visual display terminals on some visual functions.
Subjects and Methods: hundred fifty computer operators working in
different institutes were randomly selected. They were asked to fill a
pre-tested questionnaire (written in Arabic), after obtaining their verbal
consent. The selected exposed subjects were were subjected to the
following clinical assessment: ١-Visual acuity measurements
٢-Refraction (using autorefractometer). ٣- Measurements of the ocular
dryness defects using the following different diagnostic tests: Schirmer
test-,Fluorescein staining , Rose Bengal staining, Tear Break Up Time
(TBUT)and LIPCOF test (lid parallel conjunctival fold). A control
group included hundred fifty participants, they are working in a field
does not necessitate exposure to video display terminals. Inclusion criteria of the subjects were as follows: minimum three
symptoms of computer vision syndrome (CVS), minimum one year
exposure to (VDT, s)and minimum ٦hs/day in ٥working days/week.
Exclusion criteria included candidates having ocular pathology like:
glaucoma, optic atrophy, diabetic retinopathy, papilledema The following complaints were studied: ١-Tired eyes. ٢- Burning eyes
with excessive tear production. ٣-Dry sore eyes ٤-Blurred near vision
(letters on the screen run together). ٥-Asthenopia. ٦-Neck, shoulder and
back aches, overall bodily fatigue or tiredness. An interventional protective measure for the selected subjects from the
exposed group was administered, it included the following (١)Educational program that include instructions about room illumination,
site of the screen and viewing distance and display resolution properties
also taking rest for the eyes.(٢)Local artificial tears eye drops and
ointment use, with its lubricating and soothing effect that helps to
overcome the eye fatigue and dryness. Reevaluation after diagnosis and
intervention was performed as follows: after one, two, four and six
months. The electromagnetic field of the VDT used by exposed subjects was
measured by AC MILLIGAUSS METER MODEL UHS;. The range of
frequency was in milligauss. Results: Among the exposed subjects studied, ٩٢% complained of tired
eyes ٣٧٫٣٣%compained of dry eyes, or sore eyes, ٦٨% complained of
headaches, ٦٨% complained of blurred distant vision, ٤٥٫٣٣%
complained of asthenopia and ٨٩٫٣٣% complained of neck, shoulder
and back aches. Meantime control group complain was ١٨% of tired
eyes, ٢١٫٣٣% of dry eyes & ١٢٫٦٧% of neck, shoulder and back aches.
Conclusion: Prevalence of computer vision syndrome was noted to be
quite high among computer operators. Compared to those working in a
field does not necessitate exposure to visual display terminals.