![]() ![]() Recently I noticed an eye floater in my eye (I only have slight myopia, and I use the iPAD 4 everyday, a lot) and decided to change a few things in my routine, like only using the air conditioner when going to bed (not only that is not too good for the eyes, it can make us feel a lot more relaxed than we should), buy sunglasses from a good brand (and stop using the cheap ones that can't offer any protection), turn off the lights in my room (the ones over my head, instead I am using a lampshade, positioned in a table, away from me and in an indirect angle). The retail optometry industry also has a vested interest in the position that "eyesight problems are purely genetic" In reality it's just that there are few studies on this subject because it's difficult to study. If you Google you'll find plenty of posts on forums etc basically saying that "nothing causes nearsightedness ever". That's how the eye works and develops, according to people who actually study the eye. The brighter your environment, the smaller your pupils, and the easier it is for your cornea to adjust to get the image in focus on your retina. The wider the aperture the less is in focus (depth of field). This is equivalent to aperture on a camera. Why does brightness matter? Because the dimmer the screen the wider your pupils open. That can mean either eye elongation or the shape of the cornea. If you spend a lot of time looking at a screen close to your face, your eyes' growth will adapt to close work, IE nearsightedness. It's been shown by experiements with horses that if you put lens in front of their eyes as they're growing, their eyes adapt to the lenses. The reason for that is that the growth of your eyes depends on the circumstances they face. 17 Studies of Aboriginal peoples and Inuits have shown increasing incidence of myopia correlating to the increased near work demands. ![]() 14-16 The process continues into the third decade of life with graduate students, microscopists, and military conscripts becoming more myopic with more near work. Myopia has been correlated with the amount of school work and level of educational attainment. "Epidemiological surveys have shown that myopia is more prevalent in individuals who spend more time reading or performing close work than those who spend more time not using their eyes at near. It's established that populations with a tendency to read and write a lot have higher incidences of nearsightness. I haven't found any specific study yet but. ![]() I came across this thread searching for data on this subject. Sorry, I gotta stress some of those points, as I think there's a lot of myths flying around, but not all of them are bad myths. That's why Apple built in an ambient light sensor to their MacBook Pro. So the reality is that it's best for you to match ambient lighting and screen lighting. And as explained above again, more light is. Inversely, if your screen is significantly brighter than ambient, then by looking at the screen, you are receiving a lot more light than necessary to "see" things. Not to mention focusing also takes a toll on your brain and nerves, which is not good. And like I just explained above, more light is bad. And if you try to focus your eyes more on the screen in order to "see" things, then you're forcing your eyes to take in more light. So if ambient lighting is significantly brighter than your screen, your eyes would have a harder time "seeing" the screen. Basically, your eyes also know how much light it needs to receive in order for you to "see" things. That's why when you are in dark places, the outside look a lot brighter, and when you are outside looking into dark places, it's usually almost pitch black. Your eyes adjust for exposure level depending on the average amount of light that it receives. So technically, less light (lower brightness) is ALWAYS better, as less light does less damage. and probably the rest of your body as well. But in the extreme cases, it may actually disintegrate your eyeballs. In the worst case scenario, you'll go blind. When light goes into your eyes, that kinetic energy is absorbed completely by your retinas, and depending on how high the energy level is, it can range from hurting your retinas. ![]()
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