Blue Light Glasses
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Arsalan Rashid explained in a blog about Presbyopia that your eyes lose their flexibility as you age and its inevitable. A graph by The Australian Institute of Health and Welfare show that the majority of people in Australia have eye conditions as they age. New advancements in surgery can replace the need for eye glasses (which corrects vision when worn).
The America Optometric Association (AOA) wrote about the vision of adults 41 to 61 and vision as you age. One cause being a reduction in tear drops that are essential for healthy eyes. A article by Amy L Sheppard and James S Wolffsohn from Aston University in Birmingham UK wrote how Digital Eye Strain (DES) cause eyestrain, blurred vision, dry eyes and headaches. A poll of New York Office building workers reported some feeling symptoms some of the time however most don't need a poll to know how they feel from using a computer.
Asthenopia or Eye Strain is normally from 2 reasons
The first is the external of the eyes from dry eyes which is causing irritation or burning of the eyes.
The second is the internal of the eyes called binocular vision stress or stain, ache or headache behind the eyes.
LED screens are normally backed by a fluorescent screen and new fluorescent lights may be why many are feeling fatigue in their eyes. My electrician boosts about how little power fluorescent lights use, and may explain why office workers and computer users feel the burn from using screens, the high use of fluorescents in offices and LED screens, Tablets and Smart Phones all which have a fluorescent backlight and lots of blue light.
A article by bestbuy explains that LCD (expensive) are new computer screens which replaced the old LED screens but most smart phones are LED. A techtip here explains the difference in screens
So if your working in a office with a new computer its most likely the fluorescent lights making your eyes sore but with smart phones and tablets its the screen.
A article by Illuminating Engineering Society try's to bunk the idea of overexposure to blue light by comparing the light in a warehouse to a LED screen and stating there is 27 times more blue light outside on sunny day than a LED screen. In a attempt to try and find the watts require for a café I built I found that the light required varies greatly if its a supermarket which requires the greatest watts (with fluorescent) is half that required for a shop and less for a restaurant or warehouse. As anyone knows simply walking around on a very bright day is tough and I spend all day squinting if I forget my sunglasses. On those days I get a headache. Noting that less than 1% of light actually reaches the retina (article).
So now lets look at if blue light effects the internal eye.
As show above blue light sits between approx. 380nm and 500nm. This was featured in a article which explains the shorter the wave length of light the more energy it contains. A nm or nanometers is one billionth of a meter or 0.000000001, light between 400nm to 700nm has radiation. Blue light is approx. 1/3 of all visible light. Radiation is the same light that you get a sunburn from. As blue light has the most power and has radiation than you are burning your retina with blue light. That's why its hurting your retina and I don't get a headache when i wear my sunglasses outside. If I'm on a laptop top, tablet or bright screen right in my face I get a headache but I don't in a dimly lit room like sitting in the lounge room with the kitchen light on watching the tv. That's why nan said don't sit too close to the tv you'll hurt your eyes. Funny how nan was always right. As blue light can also effect your biological clock by 1.5 hours a day and sleep patterns are typically in 1.5 hour cycles then too much blue light can cause serious sleep problems, I'd write about than next time.
References[edit]
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