Do apps and glasses that filter blue light actually work?

By: Kayla Matthews

You’re likely looking at a source of blue light right now: Gadgets like computers and smartphones emit it, along with LED light bulbs. You might have also heard—or read a headline claiming—that blue light is bad for you.
But like the years-long debate on whether radiation from cellphones or Wi-Fi networks cause cancer, the truth about blue light’s health effects is murky.
Nevertheless, the evolution of technology health concerns has led to a fascination with apps and gadgets that filter blue light. Consumers are left to flounder in the face of a marketplace that includes screen protectors, eyeglasses, and downloadable apps.
Here’s what the research on blue light actually tells us, plus a guide to navigating the blue-light-filtering marketplace.

What is blue light?

Each color in the visible light spectrum is represented by a different wavelength of light, Erin Lally of Eye Consultants of Silicon Valley explained to the Daily Dot. Blue light is a high-frequency component of the spectrum that emits energy at 380 to 500 nanometers.
“Due to this high-energy emission, many electronic devices (TVs, computers, laptops, smartphones, tablets) use LED backlight technology to enhance screen clarity and brightness,” Lally said.
Some people have raised concerns over LED light because blue light is said to be able to penetrate all the way to the back of the eye. Concerned parties think this could cause damage such as macular degeneration, which leads to blurred vision, making it necessary for individuals to protect themselves against too much screen exposure.
Despite the popular beliefs, Lally contends there is “no scientific evidence” that blue light coming from digital devices will harm the eye. Any discomfort or irritation from staring at your screen too long is from straining your eyes, not from the light itself………..
Source: Daily Dot