The American Optometric Association identified the following 14 CVS symptoms:
| 1. Eye fatigue
||8. Experience blurred near vision
||9. Slow in accommodation and focusing of the eyes
|3. Sore eyes
||10. Excessive tearing
|4. Dry eyes
||11. Experience discomfort when wearing contact lenses
|5. Red eyes
||12. Change in colour sensitivity
|6. Burning eyes
||13. Glare sensitivity
|7. Experience blurred distance vision
Causes of CVS:
Lack of blinking:
when using a computer, we tend to ˇ§forgetˇ¨ to blink as often because we are always re-focusing. The lack of blinking causes our eyes to become dry, turn red and irritated.
Over exposure to bright light:
it is important to have proper lighting when working in front of a computer, meaning the lightings should be evenly distributed in our surroundings and that there is no bright light in our field of vision. However, we are often have too much light in our surroundings, for example, we have overhead lighting, table lamps, etc. Too much bright light can cause glare which has adverse effects to our eyes.
Squinting is a natural reaction of the eyes when exposed to glare produced by computer screens, fluorescent light, sunlight through the windows, etc. Squinting can cause headaches and eye fatigue.
Computer screens of poor quality:
Poor quality computer screens often have low resolution, low pixel numbers, high contrast colours and flickering screen. Such characteristics of a low quality screen can give extra strain to the eyes.
Light reflected by the computer screen:
Reflections on the screen may block out parts of the screen, forcing the user to move around and sit in an awkward position. Sitting in an improper position for a long period of time, can cause orthopedic problems such as back, neck and shoulder aches.
Steps to preventing CVS:
Use a high quality screen
Increase the resolution
Remember to blink your eyes frequently
Make sure there is proper lighting and even brightness at your workstation
Do not place the screen facing the windows
Take away any source of glare in the office
Angle the screen slightly below eye-level
Position your screen 50-60cm away from your eyes
Seek professional guidance from the optometrist, and go for eye-examinations annually.