Why you should wear anti-blue light glasses?
The blue light doesn’t actually appear blue to the naked eye. “Blue light is the portion of the visible light spectrum with the shortest wavelengths (400 to 500 nanometers or nm) and with the highest energy, hence it is often referred to as high-energy visible (HEV) light,” according to Dr. David Friess, OD, FAAO, of the Eyesafe Vision Health Advisory Board.Our eyes don’t block blue light well. The cornea and lens block UV rays from reaching the back of the eye (the retina). Blue light passes through these structures and can reach the retina.
“There are also two primary domains of blue light highlighted,” Friess says. One kind of blue light damages cells of the retina, while other blue light affects our wake/sleep cycle."
This “good” blue light “appears to contribute to physical and emotional health,” he says.
“We get constant exposure to blue light from ambient sunlight, computer screens, tablets and mobile phones,” said Dr. Rohit Varma, MD, MPH, founding director of Southern California Eyecare and Vision Research Institute.
“The brain associates blue light as daytime, so if a person is exposed to blue light for long periods of time during the night, blue light makes it more difficult for us to fall asleep at night and wake up in the morning,” Dr. Varma said.
While there’s no definitive information on the exact amount of blue light you can be exposed to before showing serious side effects, long-term exposure to screen light can have some intense serious side effects. Headaches, disorientation and loss of sleep are just the start of it.
All that screen time may be causing digital eye strain. Late-night screen time throws off sleep patterns, because blue light affects melatonin (the sleep hormone) levels.
How? Decreased light at night signals the body to generate sleep hormones like melatonin. Blue light disrupts these signals, and less melatonin is generated.
That’s why, anti-blue light glasses are a great way to combat the eye strain and sleeplessness that come with excessive screen time.
Blue light lenses filter out blue light by blocking the transmission of a specific segment or range of wavelengths. In addition to actual filtering, the lenses are designed to help reduce the occurrence of digital eye strain and avoid circadian rhythm cycle disruption, affecting sleep and overall well-being.
As the average time spent on devices and in front of computer screens for adults is pushing 11 hours per day, and as such, our eyes are under a lot of digital light strain.
Even if you don’t need glasses to see clearly, it’s a good idea to always wear blue light blocking glasses when using digital devices. Similarly, if you spend a lot of time looking at your phone at night, blue light glasses might help you. Digital screens are major sources of blue light, specifically the kind of blue light our bodies use to regulate our sleep. Whenever we use our digital devices, especially late into the night, we’re actually telling our brains to keep our bodies awake. Research shows that wearing anti-blue glasses 3-4 hours before bedtime can lead to better and more restful sleep.
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