Blue Light 101:
All the Basics You Need to Know.

By Eyeplus Optometrist

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Light is made up of electromagnetic particles that travel in waves. Human eye is only able to see one part of this wavelengths spectrum, the Visible Light, which contains blue light.

Blue light has a very short wavelength. As they are shorter, these Blue Light or High Energy Visible (HEV) wavelengths flicker faster than longer and weaker wavelengths. Hence, Blue Light (HEV) produces higher energy.

Source of blue light:

  • Sun
  • Televisions
  • Smartphones
  • Laptops
  • Tablets
  • LED lighting

The amount of blue light from these smart devices is only a fraction of the amount of blue light emitted by the sun.

However, the amount of time people spend using smart devices and the close proximity of these screens to the user's face in modern lifestyle might cause a long term effects on eye health.

Effect of Harmful Blue light:

  • Eyestrain
  • Headaches
  • Physical and mental fatigue
  • Retinal damage and contribute to Age-related macular degeneration

Is all Blue Light bad for you?

Since blue light is giving bad effect to our health, why not block all the blue light?

Some blue light exposure is actually beneficial and essential for good health.

Beneficial Blue light:

  • Boosts alertness
  • Helps memory and cognitive function
  • Elevates mood.  
  • Daytime exposure to blue light helps regulating circadian rhythm — the body's natural wakefulness and sleep cycle. 

But too much blue light late at night (from smart devices) can disrupt this cycle, potentially causing sleepless nights and daytime fatigue.

How to block Harmful blue light?

  • Turn on Blue light filter on your smartphone
  • Using Blue Light protection lenses
    • Example of eyeglass lenses with blue light protection are Essilor Prevencia, Kodak UV Blue, Hoya Blue Control etc.

Contact us for more information on ophthalmic lenses with blue light protection.

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