Computer vision syndrome

This presentation discusses about Dry eye due to Computer Vision Syndrome. It defines one of the cause of Dry Eye which occurs due to long hours working in front of Computer screen, Laptops, Mobiles etc

1. Computer Vision
Syndrome
Dry Eye Syndrome and other Eye problems due to use
ofcomputer , Laptop and Mobile phone.
A Presentation By Surya Prajapat

2. What is Computer Vision
Syndrome?
Computer Vision Syndrome (CVS) is the general term
used to describe a variety of vision related symptoms
that may be aggravated by regular use of a computer
for two or more hours a day.
The longer the use of computer
leads to a decrease in blink reflex.

3. •This means that while working using a computer,
we tend not to blink as often as we should.
•Normal Blink rate : 16-20 per minute.
•During computer use, blink rate : to 6-8 per
minute.

4. Blinking is critically important for spreading of tears
to form an even film on the eye surface and also in
refreshing this tear film.
Thus in the absence of adequate blinking, eyes
become dry and irritated.

5. Why Computer & like devices are
culprit????
•When we look in the distance, our eyes are
relatively relaxed and at rest.
•But when we look at computer continuously :
Characters (pixels) on computer screen do not have
well defined edges. They are brightest at the center
and diminish in intensity towards the edges.

6. •This makes it very difficult for eyes to maintain
focus.
Extensive focusing does not give much opportunity
to the eye muscles to move and this leads to eye
strain, burning, tired –eyes feeling.

7. a. Poor position in
relation to computer
Causes of Computer Vision
Syndrome

10. Other contributing factors
Constant gazing at a near distance at the monitor
(which leads to convergence fatigue).
• Fixed posture while working long hours
• The eye muscles do not get much opportunity to
move.
• Uncorrected visual defects
• Glare from lighting in the work place and direct
light coming in from the exterior

11. Symptoms of CVS

12. Symptoms…….

13. Prevention or Things to be done
to minimize CVS
•To begin, anyone who suspects CVS should have a
Thorough eye examination by an
Ophthalmologist
•Apart from this, a few additional steps can help
reduce CVS

14. Blink more Often
Computer users should make a conscious effort to
blink more often:
•They should try the suggested formula
20 : 20 : 20
Every 20 mins: look 20 feet : for 20 secs

15. Adjusting height of the seat and Computer
screen distance from eye
Adjust the height of the desk or chair so that the middle
of the computer screen is about 20 degree below eye
level.

16. Reduce glare
•Direct the overhead lights away from computer
screens.
•Position your monitor so that all windows are to
the side rather than to the back or front.
•Adjust window blinds so that sunlight is away from
screen and your eyes

17. Take a Break
Computer users can reduce fatigue by taking breaks
from work and can benefit from taking a five minute
break for every 30 minsof work.
Avoid air drafts
Avoid siting in front of an air conditioner facing its air
draft while working on computer.

18. Dry Eye due to Computer
Vision Syndrome
When working on Computer or mobile phone for a
longer duration, following eye problems may occur :
1.feeling of dryness, grittiness, burning, itchiness or
scratchiness of the eyes
2.sensitivity to light
3.blurred vision
4.excessive tear flow (caused by an imbalance in
the tear film)

19. •This usually happens because of a deficiency in the
aqueous component of the tear film or an increase
in tear evaporation, or a combination of these
events.
The normal tear film The dry eye tear film

21. Clinical Test of SeverityUnits Parameters Reported
Functional Tests
Evaporimetry g/cm2/sec Evaporation rate
Schimer Test mm Tear production
Optical scattering OSI Visual stability
TBUT seconds Tear Stability
Interferometry um Lipid Layer thickness
Blink rate blinks/min Tear Stability (indirect)
Molecular Tests
Tear Osmolarity mOsm/L Tear concentration and stability
MMP-9 ug/ml inflammation
Cytokine profiles (IL-1, etc) pg/ml inflammation
Lactoferrin/Lysozyme mg/ml Tear production
Subjective Tests
Corneal staining grade 0-4 Damage (mucin deficiency)
Conjunctival staining grade 0-4 Tissue Damage
MGD grading grade 0-28 Gland obstruction and inflammation
Symptoms (OSDI) score 0-100 Discomfort
Diagnosis
Various Clinical Biomarkers of Dry Eye
Disease Severity

23. Thank You
A Presentation By Surya Prajapat