Human’s vision is not suitable for long lasting looking at the computer’s monitor. It can cause eye pain, blurred vision, and even headache. Among computer users complaints about eyes surpass complaints about pain in the wrist joints. Different researches show that approximately 70% of computer users suffer from vision impairment that is known as CVS or, in other words, Computer Vision Syndrome.
Overwork of Eye muscles
The most common symptoms of CVS are burning sensation in the eyes, blurred vision, and headaches. There may also be symptoms like tension and dryness in the eyes, slowed focus of image, discomfort during usage of contact lenses as well as pain of neck and back.
The cause of CVS is an excessive load and stress to your eyes. Closely looking at the monitor, muscle of vision focus is strained, and like any other muscle, also eye muscles hurt when they are overstrained. Because of long lasting looking at close objects, there may develop a condition that is known as spasm of accommodation. Consequences of this condition are impaired focus of image or even temporary myopia, which can last from few seconds to several hours.
Overwork of eye muscles may lead to such complaints of computer users as blurred vision after work or during driving a car. While such complaints may also be caused by reading and working with documents in the office, experts are sure that the computer monitor causes more harm to eyes.
When looking in the monitor, vision is more strained
The monitor causes greater effort of vision because the letters on the screen are not so clearly visible as they are on the paper. To make sure, look at the screen through the magnifying glass – the letter consists of pin-sized light flickering, and it does not have clear boundaries. Laptops with LCD screens are better for eyes because their image is sharper and thus clearer.
Researches show that dry burning sensation in the eyes is caused by the fact that, sitting at the computer, eyes are being blinked for about two-thirds less often than usually (usually eyes are being blinked for 21-22 times per minute, but when working with a computer – about 7 times per minute). In particular, it relates to users of contact lenses, therefore doctors recommend the use of natural tears, which are available at the pharmacy or optician’s shop.
The majority of doctors believe that too intensive work at the computer can cause only temporary eye ailments, for example, aching eyes, but some doctors believe that computer users are subject to more serious consequences as well, for example, to myopia. Although there are no clear evidences that computers form some changes in lenses or eye muscles, doctors warn that those, who have myopia in the family, have to be careful with the usage of computers.
Where to put the monitor?
CVS can also be caused by other reasons, for example, by the usage of inappropriate eye glasses or by wrong location of computer. People with inappropriate glasses are looking at the screen at the wrong angle. For example, users of bifocals often turn their head so that they can look at the screen through the lower edge of glasses, while myopic bend forwards, causing pain of neck, back, and shoulders muscles. The same is caused by the screen that is positioned too high or too low. The monitor should be placed at eye level, at arm’s length (about 80 cm).
- Blink your eyes, as blinking protects your eyes from drying out;
- Rest your eyes – draw away from the screen and look around or look out of the window; close your eyes time by time; it is not recommended to work with a computer without a break longer than 2 hours; make sure, that a break is at least 5 – 10 minutes long.
- Place the monitor so that the light does not shine directly on the screen; if it is not possible, then cover it with a screen hood or some screen filter;
- If possible, use a larger monitor;
- The screen should be with dark letters and light background;
- The screen should be placed no less than 80 cm from the eyes;
- It is important to do a regular vision inspection; if you feel that your eyes hurt, dry, or blur, or your head aches, go to your eye doctor to prevent these symptoms.