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As someone who grew up in China, we were forced to do this exercises everyday at school. And yet, China has the highest myopia rate.
by billconan 2y ago
As someone who grew up in China, we were forced to do this exercises everyday at school. And yet, China has the highest myopia rate.
- deleted 2y ago[deleted]
- Anotheroneagain 2y agoIt's poorly grown orbits primarily from lead deficiency possibly also from iron poisoning (which blocks it, as well as several other metals) and the lack of other heavy metals.
- rojeee 2y agoI remember teaching in China nearly 20 years ago and all the kids did this. I thought it was so strange. Crazy music would come on between each class, which was the prompt to start “eye exercises”. They all stopped what they were doing and massaged their eyes and forehead for about two minutes. Then got back to doing whatever they were doing. Non-participation was punished.
- onemoresoop 2y agoMaybe these exercises help some people but myopia is largely hereditary. It's worth trying though, it's free.
- yorwba 2y agoAnything that is even slightly hereditary looks "largely hereditary" in the absence of environmental factors. That doesn't mean that large changes in environmental conditions cannot have a large effect on hereditary traits. Body height is largely hereditary if you can avoid malnutrition. But improved nutrition has led to an increase in average height over time. It's not improbable that spending ten hours a day indoors to study could have an effect on myopia in children, even if the variation among children who all study for approximately the same duration appears to be explainable by hereditary factors.
- User23 2y ago> Body height is largely hereditary if you can avoid malnutrition. But improved nutrition has led to an increase in average height over time. To be clear, good environment increases the phenotypical expression of genotype. A malnourished population will have lower height variance than a well-fed one ceteris paribus.
- robwwilliams 2y agoDo you have a reference for that? The variance of most traits will increase as the variance and volatility of the environment increases. My guess is that the variance in stature in countries like Holland and Sweden has actually decreased significantly over the last 100 years. Military recruitment records would be the place to start looking. But I honestly do not know the answer. Perhaps I should ask an LLM. But this might be a goid place to start instead. https://ourworldindata.org/human-height https://ourworldindata.org/human-height
- xpe 2y ago> It's worth trying though, it's free. The above claim strays far from the way of logic. Follow that pattern of thinking, and you'll never run out of things to try.
- daveguy 2y agoIt's only free if you don't value your own time.
- colinb 2y agofrom the conclusion: "Overall, the results suggest that eye exercises have limited to no efficacy in preventing or controlling myopia progression. Until robust evidence supports their efficacy, available evidence suggests retiring the eye-exercise policy."
- rahimnathwani 2y agoISTR reading that lack of time outdoors is one of the culprits. This study wasn't conclusive: https://iovs.arvojournals.org/article.aspx?articleid=2360831 https://iovs.arvojournals.org/article.aspx?articleid=2360831
- hosh 2y agoTaiwan had something similar, found it it has to do with outdoor lighting (because many kids in both China and Taiwan stay indoors to study), and started a program to let kids play outside. Along with an early childhood intervention, myopia rates have been dropping.
- robwwilliams 2y agoOne would need to control for brightness differences. Light levels outdoors will generally be much higher. As a result, the pupillary diameter will be smaller (a higher f stop in camera terms) and the depth of field will be much deeper and allow higher spatial frequency “reading” with minimal physiological accommodation.