04/07/2021
Blue light facts: Is blue light bad for your eyes?
To better understand the risks and benefits of blue light, here are a few things you should know.....
What is blue light?😲
Visible light contains a range of wavelengths and energy. Blue light is the part of the visible light spectrum that contains the highest energy. Because of its high energy, blue light has more potential to cause harm to the eye than other visible light. 😲
1. Blue light is everywhere.
Sunlight is the main source of blue light. Most of your exposure to blue light occurs when you're outside during the day. But there are artificial sources of blue light as well — including computer and phone screens, and fluorescent and LED lights.
2. The retina is susceptible to blue light.
The cornea and lens are effective at blocking UV rays from reaching the light-sensitive retina at the back of the eyeball. But virtually 100% of high-energy visible blue light passes through these structures and reaches the retina.
3. Blue light might increase the risk of macular degeneration.
The fact that blue light reaches the retina is important. In laboratory studies, blue light has been shown to be harmful to light-sensitive cells like those in the retina. The damage resembles that caused by macular degeneration, which can lead to permanent vision loss.
More research is needed to determine how much blue light from sunlight and digital devices is “too much" blue light for the retina. But many eye doctors are concerned.
It's possible that blue light exposure from extensive use of digital devices might increase a person's risk the of macular degeneration later in life. Until long-term population studies can be done, though, it's too soon to tell.
4. Blue light contributes to digital eye strain.
Blue light scatters easily and is the first to go out of focus. Poorly focused blue light reduces contrast and can contribute to digital eye strain.
5. Not all blue light is bad.
Long-term exposure to high-energy blue light may have risks, but some blue light exposure is essential for good health. So, 100% protection from all blue light is not a good idea.
Beneficial blue light (455-500 nm) boosts alertness, helps memory and cognitive function, and elevates mood. Also, beneficial blue helps regulate circadian rhythm — our natural wakefulness and sleep cycle.
But too much blue light at night can cause sleep problems, daytime fatigue, and even serious health problems.