The True Relationship Between Screens, Books and Nearsightedness

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misbahulalam
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The True Relationship Between Screens, Books and Nearsightedness

Post by misbahulalam »

At one time or another we have surely heard or read that the excessive use of screens is causing an increase in cases of nearsightedness. Moreover, it is said that this relationship is direct, meaning that screens are responsible for the fact that more and more people around the world are nearsighted. Not surprisingly, there are also studies that conclude that children who spend more time in front of books or screens develop more nearsightedness than those who do not. And not only that. We have always assumed that nearsightedness and the use of glasses is directly related to performing tasks that require a special visual effort. Or to very studious people, or to avid life-long book readers. Since we have recently replaced many of these tasks that involved reading paper with electronic screens, we have shifted the responsibility from one culprit to another. However, this long-assumed direct relationship has not been scientifically proven.

Although it is considered to be true because of the correlation/causation hypothesis, it is important to be careful with these parallels, since correlation does not always imply causation. A weekly email with evidence-based analysis from Europe's best scholars Tyler Given, a Harvard lawyer, does an excellent job of explaining this. On his website Spurious Correlations, he has been carrying out a statistical experiment with arbitrary data obtained from different sources for years – data that Phone Number List when overlapped on graphs generates some of the most far-fetched correlations. For example, it can be deduced from the data that between 2000 and 2009 there was a correlation between the increase in per capita cheese consumption and deaths caused by becoming entangled in bedsheets. Sounds absurd, right? Correlation between per capita cheese consumption and deaths by becoming entangled in bedsheets. Tyler Given / Spurious Correlations, CC BY What is certain is that the increase in cases of nearsightedness is real and cannot be entirely explained by genetic factors. Therefore, it is necessary to look at environmental factors.

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Accomplices – but not the main culprit Are screens – or rather their excessive use – the cause of nearsightedness? The latest studies suggest that they are not directly responsible. Nearsightedness, which is the difficulty focusing on distant objects, occurs when the eyeball is too long relative to the focusing power of the eye’s cornea and lens. This causes light rays to be directed to a point before the retina. We are also nearsighted when the cornea, the lens or both are too curved for the length of our eyeball. In some cases, all of these factors occur simultaneously. These anomalies are corrected with lenses that transmit light information to the back of our eye. The process by which an eye develops nearsightedness is not entirely known, but we do know that for our vision to develop correctly we need to promote and practice both near and distance vision. In this sense, it seems logical to suspect that ongoing exposure to screens from an early age at a time when the eye is still maturing may favor the development of vision of near objects, to the detriment of distance vision. However, there is not enough data to conclude that this causes nearsightedness to occur.
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