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What are blue-light-blocking glasses, and do they actually work?

September 7, 2022

Blue-light-blocking glasses are essentially glasses which filter out  part of the visible light spectrum with a wavelength somewhere in the range of 400 and 450 nanometers (nm).

Blue light gets negative criticism on account of its high energy and closeness to UV light in the electromagnetic spectrum (10–400 nm). UV light has been linked to eye damage for some time, yet there is less proof to show the possible damage with visible light. Since most LED gadgets have a peak emission of 400-900 nm, there’s a lot of worry over what can happen if you have prolonged exposure to the computers and gadgets that a large number of us use for really long periods of time.

It is said that the most offending portions of the Electromagnetic spectrum are the UV-A (315 nm to 400 nm), UV-B (280 nm to 315 nm), and the "blue-light" part of the visible spectrum (380 nm to 500 nm).

Fortunately, there’s little proof to demonstrate that blue light from LED gadgets is harmful. Despite the fact that we are convinced that exposure to blue light from LEDs in the range of 470-480 nm for a short to medium period (days to a few weeks) shouldn’t significantly increase the risk of development of ocular pathologies, this conclusion can’t be summed up to a long-term exposure (months to years).

Researchers accept that more studies are required on long-term exposure to low levels of blue light.

The truth of the matter is, with enough brightness and exposure time; all light can be harmful to the eyes.

Blue light isn’t bad all the time. A healthy amount of blue light is important for keeping up with your circadian rhythm, or sleep-wake cycle. Yet, blue light additionally hinders the body’s release of melatonin, keeping us alert during daylight hours.

Blue light is important for our well being. Blue light deprivation (BLD) can cause an increased risk of restlessness, depression, and sleep deprivation. Like everything in life, balance is key.

Do Blue-Light Glasses Really Help?

It’s doubtful. There’s very little proof to show that blue light from LEDs is unsafe. Most blue-light-blocking glasses just filter 5%–40% of blue light.

For the time being, it is not recommended to utilise blue-light-blocking glasses for any specific eye conditions or sleep disorders.

All things considered, here are a few things that might assist with keeping up with comfortable vision and healthy habits:

  • Utilize the 20-20-20 rule: Take a 20-second break following 20 minutes of gadget use and look at something 20 feet away.
  • Ensure you are wearing your right prescription for glasses or contacts, working at a suitable working distance, and maintaining good posture.
  • Stay away from screens for 2-3 hours before bedtime.
  • To avoid dryness, use artificial tears and remind yourself to blink frequently.

Ojas Eye Hospital A Center of Excellence for Contoura Vision, Femto Bladefree Lasik in Mumbai, India.