Computer Vision Syndrome (Part I)
Only PCs used to cause problems at one time, but today, with the rise of digital displays from mobile phones to tablets to 3D TVs, they can all cause eye and eye problems, especially in teens and teens. You’re reading this, many people around the world, at home or at work, are staring at their screens and taking no precautionary measures. They gradually have adverse computer effects on the body’s health system. Many computer users complain, including: Joints, stress and even facial pains and discomfort They develop skin. Eye and eye problems caused by the computer are generally referred to as computer vision syndrome. The most common problems are: fatigue, (stenopia), burning sensation, redness and pain in the eye, headache, feeling of external jitter in the eye, tears falling, photophobia (fear of light), binocular vision, and various causes. According to reports, nearly 90 percent of people who work with computers for more than three hours. Symptoms have been reported.
Eye and vision status
The human eye sees the printed letters better than the letters displayed on the screen. The reason for this is that the printed letters have more contrast with the white screen background, and their limbs are clearer, while not the case for the screen. The letters are clearly not in print, but the letters start from a high-contrast center, gradually fading, and then disappearing into pale gray. Therefore, the edges of the letters on the screen are not as sharp as the letters.
One of the most important causes of dry eyes and irritation when working with a computer is a decrease in the amount of blinking. Adults blink about 20 times a minute but decrease to 4 to 5 times a minute when working with a computer. The screen and focus on the workpiece make the eyelids stay longer, resulting in more tears on the surface of the eye. Production of the new lacrimal layer by blinking and pressing on the meibomian glands is also delayed by less blinking, leading to temporary dry eye.
In addition, unrecorded refractive errors, especially hyperopia, stigmatism, and non-corrected eye work, hidden aberration, binocular vision disorders, lacrimal system disorders are the causes of computer-mediated visual syndrome. Eye diseases such as keratoconus and chlamydia can also cause eye fatigue due to irregular stigmatism.
Worsen the use of inaccurate glasses, tilted frames, unshielded, scratched and dirty cvs lenses. The use of contact lenses alone can cause dry eye effects. Types of inadequate, obsolete contact lens wearers increase the symptoms of cvs due to reduced oxygen passage.
General weakness, insomnia, underlying illness, drug use, and tendency to migraines and psychological factors such as anxiety, nervousness, and job satisfaction are all associated with symptoms of eye fatigue. Of course, age and gender are also effective in causing symptoms of eye fatigue. Elderly weightlifters are more prone to fatigue.
Many common complaints of users, such as neck and back pain, may be due to an inaccurate situation or inappropriate position or height of the computer. If the screen is higher than the eyes or the angle is not right. Eye dryness and numbness increase and cause eye fatigue. The neck and eyes should bend slightly when looking at the monitor and as a result the top of the monitor should be slightly below the horizon of the user’s eyes. The monitor and keypad should be adjusted to a suitable height. Use a typewriter to keep the user at ease: Only the keyboard should be at an elevation above the fingers and toes, ie the wrist above the fingers.
It is best to have the armrest and the height of the armrest to support the arms. The armrest should not be too high or pulled forward. The chair must fill the waist area. In the sitting position behind the computer, there should be a vertical angle between the thigh and the waist, and a slope below 10-15 degrees should be preferable.