Our eyes relax naturally relax to a point that is further away than the working distance to the computer. This is understandable enough as most of us have only started working digitally in any form in the last 15 years. Our eyes focus on the screen when working but relax to a point somewhere behind the screen (technically this is called the Resting Point of Accommodation - the RPA). This constant movement is what creates fatigue, generates burning and tired eyes, and all the other symptoms associated with CVS (Computer Vision Syndrome). |
5 Contributing Factors to CVS:
1. Digital screens - The near focusing effort required for working on digital screens creates a strain the eye has never had to deal with before. The dust particles put out by the electrostatic field surrounding most computer monitors settle on the eyes as you sit working on the screen.
2. Lighting – The glare from the digital device can cause eye strain, e.g. computer glare. Poor or improper lighting conditions in the environment also causes glare. Harsh lighting, particularly from fluorescents creates a strain on the eyes.
3. Ventilation - Air moving past the eyes from overhead vents can irritate the eyes as can dry, hot air generated by computer monitors. Eye strain can also come from the direct air from a fan, or natural air drafts which runs across your eyes sucking up the moisture over time.
4. Human eyes - It's a new digital universe for the eyes. The variety of digital devices and the flow of information is growing all the time. In less than 20 years pixels have replaced print as our major medium for getting information. And this requires a new and different effort from our eyes, which we have yet to understand the implications of fully. But we can already see symptoms of computer eye strain and just as spectacles were invented to deal with the problems of reading print so digital eyewear will become a new element in our world.
5. Computer users – Our eyes are exposed to digital screens multiple times more often than we are exposed to sunlight and are only now realizing that this is having an impact on our vision. The lack of understanding on how the eyes function while working on a computer means we do not pay attention to positioning of monitors – distance to, height of – or positioning of our line of sight relative to monitors – seat height, table height, etc. All are factors that contribute to CVS.
Just as we invented spectacles to deal with issues arising from print, and sunglasses to deal with impact of sunlight on our vision so glasses for computer use – digital eyewear - is the simplest and most comprehensive way to reduce computer eye strain.
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