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Why myopia is on the increase in children


As the editors of the Erasmus University Medical Center Netherlands editorial suggested, “young children can be more sensitive to myopic triggers in the environment.” An earlier eye study in children in Sydney, Australia also found that only the youngest who became nearsighted spent more time working nearby rather than being in the light of day.

Although many people have long believed that excessive reading promotes myopia in children, the current thought is that too much time spent indoors has the greatest effect and probably explains any apparent association between close work or close work. time spent in front of a screen and myopia.

Dr Neil M. Bressler, an ophthalmologist affiliated with Johns Hopkins Medical Institutions, said the high intensity of outside light has a big influence on the shape of the eye, which in turn affects the visibility of images.

To be in focus, the light rays in an image must converge on the retina. In myopic eyes, convergence occurs in front of the retina and a corrective lens is needed to redirect incoming rays so distant objects are in focus.

Most children are born mildly hyperopic. Their eyes are shaped like partially deflated balls, which makes the images converge behind the retina. But as they age, their eyes lengthen to form a sphere, allowing images to converge directly on the retina. However, if the elongation does not stop at some point, the eyes become more oval and the images then converge in front of the retina, the definition of myopia. Exterior light stimulates the release of dopamine which can slow the lengthening of the eye, said Dr Bressler.

Although the rise in myopia is occurring worldwide, the epidemic is raging in East and Southeast Asia, where 80 to 90% of high school students are now nearsighted.

Concern over the growing prevalence of myopia goes beyond a growing need for glasses, contact lenses, or, for those who are so prone and can afford it, laser therapy to redirect images by changing the shape of the cornea. In general, people with nearsightedness are more likely to develop vision-threatening complications later in life, such as cataracts, glaucoma, and degeneration of the macula, the center of the retina.



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