Health

How to protect children’s eyes when learning online


Placing the computer screen in the right position, sitting in the right posture, resting every 20 minutes and adding nutrients to help protect children’s eyes.

According to Dr. Nguyen Thi Ngan, who used to work at the Department of Ophthalmology, Duc Giang General Hospital, children are prone to fatigue and visual stress after daily online learning programs. The reason is that the sitting posture is not correct or the position of the screen is not suitable, the rest time is not reasonable, it needs to be overcome to preserve the children’s eyes and health.

Sit in the right posture

While learning, children may sit in the wrong positions such as: Head and upper body bent forward or tilted to one side… From there, children experience discomfort, stress, fatigue in the learning process, work, causing neck and shoulder pain, eye strain, eye irritation, blurred vision, dry eyes, and headaches. If that process is prolonged, it is likely to lead to musculoskeletal injuries related to improper working posture.

Therefore, parents need to pay attention to the sitting posture of children. Children should be seated in chairs and desks with adjustable height and backrests. Head and back should be straight, not tilted or stooped, shoulders down, legs slightly extended, creating an angle between shins and thighs about 90-130 degrees, upper body and thighs creating an opening angle of 90-120 degrees, preferably 100-110 because this position reduces pressure on spinal discs and reduces adverse effects on the spine.

Put the screen in the right position

Children may experience discomfort because the monitor is placed too high or too low, causing the chin to point up or down. Therefore, parents also need to pay attention to placing the screen at the right eye level of the child to ensure health and learning efficiency.

According to the Canadian Center for Occupational Safety and Health (CCOHS), the appropriate screen height criterion is that the top edge of the monitor is horizontal or lower than the line of sight, the angle created when the eye is looking straight ahead, and the line from the eye. The center of the screen is about 15 degrees, the angle created by the bottom edge of the computer screen with a straight eye line of about 30 degrees. The distance from the eye to the computer screen is 40-74 cm, which can be estimated as the length of an adult arm.

Reasonable rest

Even with the right sitting posture and the right screen position, children can still suffer health effects from regularly sitting for too long. Under normal conditions, the average blink frequency is about 15-20 times a minute, then decreases to 5-7 times / minute when working with computer screens and electronic devices, leading to dry eyes. . Therefore, children and people who often have to work with computers need to learn the habit of resting after a period of studying and working.

The American Optometric Association and the American Academy of Ophthalmology recommend the 20-20-20 rule. That is, every 20 minutes of working at the computer, take your eyes off the screen and look at something 20 feet (about 6 meters) away from your eyes for 20 seconds and blink often with average frequency. about 15-20 times a minute.

During online learning, teachers should set a time every 20 minutes for students in the classroom to look away from the computer screen, looking at a point about 6 meters away for 20 seconds. Teachers should remind students to regularly blink their eyes when studying with computers to avoid symptoms of dry eyes and eyestrain.

In addition, children should not study continuously with the computer for too long, remind them to get up and take a break every 30 minutes, maybe do some exercise or walk to relax the body. Children and adults also need a break of at least 5 minutes after half an hour of work.

Hanoi students in an online class in the first batch of September. Photo: HK

Light conditions

When studying in a low-light environment, children’s eyes have to adjust a lot, get tired quickly, and are prone to visual disturbances. If the light is too bright, it will be difficult for children to use the screen to learn because it is obscured by light, causing glare. Should adjust screen brightness and contrast so that fonts and images on the screen are easiest to see. Do not adjust the screen brightness too high, leading to glare and eye pain when studying. The light when studying online should not be too bright, up to 750 lux.

Nutritional supplements

It is recommended to add foods that contain a lot of vitamins A, B, C, D, E and trace elements such as zinc to help brighten the eyes. For example, vitamin A in red vegetables and fruits such as carrots, tomatoes; vitamin C is abundant in oranges, lemons, and guava; B vitamins in chicken, salmon, eggs, milk, beans, cauliflower…

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