Experts remind computer users to maintain correct sitting posture to prevent damage to vision. When you close your eyes, turn your head, relax your stiff neck, and then hunch back to the computer screen, when you ignore the repeated blurring of vision, or even the words on the monitor. You need to pay attention, you should think about it: every time you tap the keyboard, every time you watch a video, every time you send an email, is it damaging your eyesight?
Myopia refers to that only things within 40 cm from the eye can be clearly imaged on the retina. When we read and operate a computer, we use our eyes at close range, although the monitor is usually about 50 cm away. Ophthalmologists, optometrists and other ophthalmologists have found a link between staring at a computer screen and myopia, but only a small number of people deepen their myopia due to close eye use. James & middot; hay, Professor of Ophthalmology at Pacific University in Oregon, said: 'we haven't figured out exactly what's at work. '
Although not everyone will be short-sighted because of close eye use, it does not mean that there is no problem right next to the computer screen. Although most of the time close operation of the computer will not bring permanent damage, but it does bring discomfort, resulting in decreased vision and other eye fatigue symptoms. "Eye fatigue is caused by staring at a computer screen for a long time. These continuous eye use activities gradually make the eyes exhausted, and finally show a series of discomfort symptoms such as fever, dryness and muscle pain," said Mark & middot; blimore, Professor of Ophthalmology at Ohio State University. '
The best way to understand and prevent eye fatigue is to study how the eyes look at small fonts. When we look with the eyes, we actually see the light reflected by the object. When light passes through the cornea and lens, it is refracted, bent and projected onto the photoreceptor. Photoreceptors are rod-shaped cells and cone-shaped cells that collect light information on the retina. They are the innermost layer of the eye and are responsible for collecting and transmitting light information into the brain through the visual nerve, thus forming images.
The role of the ciliary muscle is to change the shape of the lens so that the eye can focus more accurately. Looking too close at the computer screen will make the ciliary muscles tense and continue to contract, which will bring great damage to this poor muscle. Focusing too close also stops us blinking. Professor Sie believes that blinking is very necessary because it can make tears cover the eyes and wet the cornea. If you stop blinking, the surface of your cornea will dry out, blurring your vision.
When we use computers, the blink rate drops from about 20 times a minute to seven times a minute, although experts don't think it will have a long-term impact. Gazing at the screen can also cause strabismus in the presence of bright light around, said Dennis Robertson, an ophthalmology professor at Mayo Medical School in Rochester, Minnesota. Although strabismus can avoid glare and prevent excessive light from hitting your eyes, it can keep the ciliary muscles around your eyes in a state of tension and make your eyes stand out all day, which is like doing nine hours of sit ups.
Eye fatigue symptoms often only last for a short period of time, as long as we blink or look at the distance, it will disappear, but as soon as it appears, it will hinder our work, and even make us upset and angry. Nevertheless, when we feel hot, painful and dry eyes, we can adjust them by improving the working environment. Configure a popular anti glare screen to reduce the contrast, which can reduce the pressure on the eyes. Similarly, placing the screen below your line of sight so that the top of the screen is at the same level as your eyebrows; going to see a doctor and wearing a pair of glasses to correct your eyesight are all necessary means to protect your eyesight.
Finally, eliminate all the dazzling and messy light around. To find out what light is causing the trouble, shee recommends a trick: cover your eyes with your hands in the shape of toothed tongues and brims, and then see if it relieves the tension on your face and shoulders. If this' hand covering 'works, dim the lights you think are causing trouble. Experts suggest keeping a proper distance from your favorite sitcom while watching TV.
However, so far, the simplest and best professional advice of all media for eliminating eye fatigue is still regular rest. Even if you are not thirsty, always walk to the water fountain; and make sure your chair is at least 0.6 meters away from the TV; at the same time, most importantly, don't forget to blink.