Anti Blue Light Glasses Are Useful ??
Nowadays, People's Daily life has been inseparable from computers and mobile phones, but these electronic products bring people more convenience and fun, but also lead to eye fatigue, myopia and other visual problems.
It has been pointed out that "high energy, short wave blue light emitted by electronic products is the main cause of dry eyes, sore eyes and eye fatigue," so the blue light-blocking glasses have been developed and are selling well.
Do blue-blocking glasses really protect your eyes, or are they just a marketing gimmick? Before we draw conclusions, we need to know what is blue light?
Blue light is a type of electromagnetic radiation with a very short wavelength that produces a high amount of energy. While it's true that light can damage your eyes under certain circumstances, there's no scientific evidence suggesting that blue light is harmful to our eyes. But many people still think it is, which is why blue light-blocking glasses are so popular.
"Everyone is very concerned that (blue light) may be causing damage to the eye, and it's a valid concern, but there's no evidence it may be causing any irreversible damage," Dr. Rahul Khurana, clinical spokesman for the American Academy of Ophthalmologists, told Business Insider.
Blue light exposure is nothing new. In fact, the sun is the largest source of blue light. Moreover, blue light is also present in fluorescent and LED light.
But if blue light isn't harmful, then why are we constantly rubbing our peepers when we're looking at our screens? The answer is eyestrain: More than 60 percent of people experience problems associated with digital eyestrain. And blue light, it seems, isn't the cause. Instead, our eyes are so strained because most of us blink less when we stare at our digital devices.
So if eyestrain is the real issue, blue light-blocking glasses are probably useless. However, wearing them could potentially help you get a good night's sleep. That's because blue light, research has shown, affects your body's circadian rhythm, your natural wake and sleep cycle. According to Harvard researchers, any kind of light — including blue light — can tamp down your body's ability to secrete melatonin, a hormone that helps you sleep.
So how should you protect your eyes if you use computers for a long time? We've compiled a few tips:
Position your screen 20-30 inches away from your face, and make sure your eyes are level with the very top of your monitor. The key thing to remember is that you should be looking slightly down at your work. The center of the screen should be located between 15 and 20 degrees below horizontal eye level.
Follow the 20-20-20 rule. Look away from your screen every 20 minutes for 20 seconds at a time and focus on a fixed point 20 feet away.
Most monitors let you adjust the color temperature manually. It's best to use a warmer (yellowish) color temperature in dark rooms and a colder (bluer) color temperature in bright rooms.
