The diseases of computer addicts

Along with many utilities, using too many computers also poses a high risk of health damage, especially joints and vision.

The diseases of computer addicts Picture 1

Recently, the official website of the Department of Health and the National Association of Medical Physicians has written an introduction on this issue, based on consultation with Dr. Luong Tue Van, Department of Rehabilitation Hospital under Taiwan National University. Information on tma.tw.

Difference between computer screen and paper

The same is the means of receiving readings, but the interface of traditional computer screens and paper surfaces is quite different. Computer screen uses cathode ray tube (Cathode Ray Tube) to electronically strike Phosphor surface on the screen to light up, display images, then use raster scanning. Therefore, the status of brightness, contrast, flicker or not of the content or text displayed on the screen is influenced by many factors.

In terms of external lighting, paper is a very stable reflective surface, moreover, sitting mostly on the table, there is no glare problem, nor is it affected by outside light. to the contrast.

Compared to paper, when using the screen, if the direction of light is not correct, it can cause glare, or too bright, but in contrast reduces the contrast of the font and screen background, affecting the degree of clarity .

Effect of keyboard on muscle and bone system

Computer users frequently use the keyboard to type, this movement is repeated many times, affecting the muscles and joints, manifesting in the following aspects:

Posture: Normal keyboard design makes the user wrist inward, the back of the hand bends toward the back (dorsiflexion) , and leaning toward the pillar, will gradually cause muscle strain, poor blood circulation, even Lice increase pressure in the carpal tunnel, suppressing nerves. In addition, if the keyboard position is too high, it will cause the right shoulder to lift, the neck muscles are in a tight state. The tilt of the keyboard will also affect the posture, the US National Bureau of Standards is 0-25 degrees, when the tilt angle is too large, it will cause the back of the right hand to bend too much, with research showing , to tilt the keyboard forward, can keep the wrist straight.

Repetitive actions: People who enter data, have to type the keyboard more than 10,000 times a day, perform repetitive movements for a long time, rest enough, will make soft tissue of the upper limb right load too much.

Use force: Research shows that most people use keyboard typing force in excess of design requirements, maybe 5 times or more.

Local mechanical pressure: When typing the keyboard, if the wrist is placed on the hard edges of the keyboard, the local pressure increases, leading to poor circulation, affecting tendons and nerves. There is a type of keyboard that has a wrist rest, to help reduce wrist flexion, but still can't reduce the local contact pressure of the wrist, so be careful Important when using.

Common health problems

According to relevant foreign research documents, regular use of computers can cause many dangers, including:

Sight

When using computers, the eyes have to look at the screen for a long time, many surveys show that most computer users often complain of blurred vision, dry eyes, aches and pains, the popularity of Symptoms of eye irritation can reach over 50%. However, there is currently insufficient evidence to show that long-term use of computers will lead to nearsightedness or other serious vision problems.

The main causes affecting the visual burden include: the time of the user viewing the screen, the distance of the position and the angle of the screen, the brightness and the angle of the external light source, the image quality of the screen such as settings for flickering, contrast, brightness and resolution, and both the eyesight and eyeglasses factor of the individual .

Musculoskeletal system

This is the most important issue for computer users. Maintaining a long sitting posture will cause muscle and bone problems, including shoulder blade muscle strain, neck vertebra stretching and excessive lumbar vertebrae, chest muscle contraction, forearm flexion, in which the part The most painful is the neck and shoulders.

Radiation problem

According to the current studies, in the case of normal operation, the level of exposure to the types of radiation of the computer user is much lower than the allowed standard, not enough to cause Significant harm to the body. No scientific research has shown that women who use computers will be affected by fertility or miscarriage and malformed babies.

Other symptoms

Negative ions in the air around the computer area will be electrostatically attracted to the surface of the screen, causing imbalance of positive negative ions in the surrounding environment, leading to computer operators with symptoms such as headaches. , fatigue, respiratory and skin symptoms.

How to fix

Table surface: When sitting at a table, the right thigh is flat, not to be stuck under the table; items commonly used on tables should be placed in a position that can be easily reached by hand, without stooping.

Screen: must be placed in front of the face, the distance from the eye is at least equal to the length of one arm stretching (40 cm), if this distance is still unclear, it is necessary to adjust the number of your glasses. The height of the screen must be lower than your eye level when viewed horizontally, even the viewing angle may be below 40 degrees. Note the light source, you can put a small mirror in front of the screen to check whether bright objects or light sources can be seen from the mirror, adjust the screen to see the least light, to reduce noise .

Keyboard: The position of the keyboard must also be straight in front, the best height is when you put your hand on the keyboard, the arm can be put down gently, close to the sides of the body, the elbows bend about 90 degrees .

Mouse: Set high on the keyboard, not too high, try to position the mouse near the middle of the body, especially those who do computer graphics often have to use the mouse.