Computer vision syndrome can be caused by prolonged computer use. When people get tired from the frequent switch between the screen and the keyboard, they may suffer computer vision syndrome. What's more, presbyopia on people above 40 may also cause CVS symptoms such as blurry vision and headache.
Symptoms appear because the eyes and brain react differently to words on a computer screen than they do to printed text. The eyes respond well to most printed material. Most text consists of bold, black letters on a bright, white background. The eyes can easily focus on images with well-defined edges that are strongly contrasted against their backgrounds. However, words and images on a computer screen do not have well-defined edges. Characters displayed on a computer screen are made up of several small dots, or pixels. The eyes cannot easily focus on pixels, so they must work harder to see the computer screen clearly. The constant struggle to focus leads to fatigue and tired, burning eyes. Many people try to compensate for uncomfortable vision symptoms by leaning forward or by tipping their head to look through the bottom portion of their glasses. These actions can result in a sore neck, sore shoulders and a sore back.
computer vision syndrome may caused by several factors, such as extended computer use, bright power source of the screen, blinking lessand low contrast. However, you can wear computer glasses to prevent CVS.