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Why are you nearsighted? Reading and studying a lot are not necessarily the main reasons!


The incidence of myopia has increased steadily over the years, especially among students. Many people still believe that the main reason is because they have to study a lot and read a lot, but some studies prove that this is not really the case.

Nearsightedness is a type of eye defect that can only see objects nearby but cannot see objects far away. This case is due to refractive errors. Refraction is the change of light when moving from one environment to another. 

Light changes direction when it passes through the cornea and lens, and converges in the retina of the eye, which then converts the light rays into a form of messages sent through the optic nerve to the brain. The brain will "translate" these messages into images that you still see.

Refractive errors occur when the texture of the eye prevents light from focusing properly on the retina. It is caused by changes in the morphology of the eye (such as the length of the eyeball or the shape of the cornea) or cataracts due to aging.

Myopia is quite common, affecting 40% of Americans and up to 90% of young people in Asian countries. An estimated one third of the world's population is nearsighted by the end of the decade - about 2.5 billion.

Why do so many people get refractive errors while others do not? This is still a mystery, but there is an emerging theory that too much time spent indoors can be the cause.

Eyes Also Need To Be Outdoors With Nature To Be Healthy

It is hypothesized that reading at too close a distance will lead to nearsightedness, due to altering the shape of the eyeball. This theory appeared centuries ago when a German astronomer, Johannes Kepler, asserted that he was nearsighted because of his research.

This theory makes sense, especially when the situation is soaring in places like Shanghai, where children spend 14 hours a week doing homework (compared to 6 hours in the US).

A strong association has been found between myopia rates and an increase in learning pressure. However, this theory has missed an important point.

That's when researchers looked at the number of books read per week or hours spent on computers, they found no significant association with myopia. The link is the number of hours spent playing sports or participating in other outdoor activities.

This was discovered in 2006 and reaffirmed in 2007, when researchers found that more time spent outside activities was associated with reduced myopia in children.
A report in the journal Nature said:
"children in the outdoors are engaged in more physical activities and this has a positive effect. When spending time in indoor sports there is no such effect; but the time spent outdoors has a positive effect, whether it's playing sports, picnicking, or simply reading on the beach, and children spending more time outdoors aren't necessarily have time to read, watch television or look close. "

According to researcher Kathryn Rose: 
"We have children who engage in both these types of activities that are intense and are not nearsighted. Looking closely still affects, but it seems that the most important issue is still exposure to sunlight of the eye."

How outdoor light affects eyesight

Research shows that nearsighted people have lower levels of vitamin D in the blood, vitamin D that supports the activity of muscles around the lens in the eye. 


"These muscles not only help light to focus on the retina, but can also help maintain the exact morphology and length between the retina and the lens, which is inherent," said Ohio State University Ophthalmology research. can be deformed during the rapid development of their eyes. "

For example, when out in the sun, for example, cells in the retina release dopamine, a neurotransmitter that slows down the growth of the eye and prevents eye stretching during the procedure development. Nature magazine also published:


"Dopamine of the retina is usually produced at night, increases sharply during the day, and alerts the eye to changes from night vision, rod-based vision, day to day vision, and cone based vision."

The researchers suspect that under dim lighting (like indoors), this cycle is disordered, causing consequences for eye development.

Three hours outdoors a day helps protect children 's eyes

Research from Ian Morgan at the Australian National University, said 3 hours a day with at least 10,000 lux of light can protect children from nearsightedness. This is the amount of light you can be exposed on a sunny summer day. In classrooms, if compared, can only provide 500 lux. It seems clear that the more children outdoors, the lower myopia is.

At a university in Taiwan, for example, when children start spending more than 80 minutes outdoors, myopia rate drops to 8% compared to 18% at a nearby school.

As reported by Ohio State University:
"The data shows that a child with a nearsighted genetic gene will be three times less likely to wear glasses if they are outdoors for more than 14 hours a week," said Dr. ophthalmologist Donald Mutti of the State College of Ophthalmology Ohio.

In Singapore, public health campaigns even encourage children to spend more time outside the home to prevent myopia.

Exposure to sunlight is important for health

There is a more important reason for eye health why you need to be extra careful when protecting your eyes from excessive sunlight, because when the sun shines shining enough spectrum into the eyes, it not only goes to the visual centers to make you visible, but also to the hypothalamus to affect the whole body.

The hypothalamus controls body temperature, hunger, water balance, and blood pressure. In addition, controlling an important organ, the pituitary gland, releases a lot of important hormones, including those that affect emotions. Exposure to outdoor light is one of the most effective treatments for depression and infections.

Studies show that low light in the workplace is more likely to cause headaches, stress, and fatigue. , fatigue and tearing, not to mention poor productivity. In contrast, companies shifting to work in light of sufficient spectrum shows improved productivity, reduced mistakes, and reduced unwarranted absences in the workplace.

Your biological clock also resides in a small center in the hypothalamus, which controls the body's circadian rhythms. The circadian rhythm is sensitive to nature, with the natural cycle of light and shadow, to function at its best.

So what affects this circadian rhythm, like not having enough sunlight, has a huge impact on health. The best way to expose to light is to naturally follow, leaving your skin and eyes in constant contact.

Diet also affects nearsightedness
Exposure to outdoor light is only a factor. Food is another factor. Studies show that among Western hunter-gatherer tribes, the rate of nearsightedness is between 0 and 2% of the population, and nearsightedness is almost nonexistent or very low at 1/1000.

Sugar and starches like bread and cereals can increase insulin levels. This affects the eyeball, making the eyeball unusually long and causing myopia, according to evolutionary biology expert Loren Cordain, at Colorado State University in Fort Collins. Cordain found that in hunter-gatherer societies, when switching to cereals and starches, they quickly developed nearsightedness (within one generation) that was equivalent to or exceeding Western society.

The reason for this is that the high insulin level caused by eating too much starch can disrupt the normal coordination between lens development and eyeball prolongation. And if the eyeballs are too long, the lens cannot become large enough to focus and create a sharp image on the retina. The hunter-gatherer food has higher protein, medium fat, and less starch than Western societies.

In addition, the amount of starch in a hunter-gatherer society has a low glycemic index, meaning that the starch is slowly and slowly absorbed, causing blood sugar and insulin to rise slowly compared to sugar and starch in Western diet.

This theory is also consistent with the observations that you're more likely to be nearsighted if you are overweight or diabetic in both adults, both of which are associated with elevated insulin levels.

Are you nearsighted? Try the Bates method
According to Greg Marsh, a certified eye trainer, nearsightedness can be treated even if you are wearing glasses. Greg's method has been developed by Dr. Willam H Bates more than 100 years ago.

A top-ranking ophthalmologist, Dr. Bates has taught this method to so many people, and is so effective that ophthalmologists have lobbied politicians to ban it in New. York. Bates how? Greg explained:

"There are basically six types of muscles around the eyes. The theory is that these muscles control the eyes. The point is maybe for emotional reasons, stress, or something you start. nervous, and at that time I didn't even know it."

You have 3 options:

Find out what makes you stressed. Get past that, and maybe look good again Dr. Bates develops ingenious tools to do this.
Use LASIK method to change eye focus permanently.
Wearing glasses, the problem with prescription glasses, is that you create a permanent stress, and will depend on the glasses.

The Bates method is not really an exercise, but rather a neurological method. Also note that this is not a medical procedure, you still need to see a doctor for examination. One of the most famous techniques is palming. Looking around determines the degree of vision.

Then simply place your palm over your eyes. Relaxing shoulders. You can lean forward on a table or on a pillow, to help relax. Relax for at least two minutes. Then remove your hands, open your eyes, and watch to see if the surrounding is clearer. Normally, it will be clear.

Bates' method is very simple, but it also requires perseverance and a little ingenuity. Remember, the goal is not to train or train your eyes better, but to relax your eyes. Greg's method also provides the same instructions. The most important is thought. When it comes to believing in yourself and the body's ability to regenerate itself, it's just a matter of relaxing, so the eye can work well with its natural structure.


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