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Ojas Eye Hospital in Bandra, Kandivali, Mumbai

Protection Of Eyes From Blue Light

August 20, 2022

Introduction

Spending a considerable amount of time on electronic devices has become a norm in today’s post covid era. Electronic devices including your laptop, phones and tablets emit blue light which is concerning because the blue light can be bad for your eyes.

What is blue light?

Energy travels in wave form. Each form of energy has a particular wavelength. Energy with wavelength 380-720nm is visible to the human eye and is called visible light spectrum. Energy with wavelength higher than 720 nm is called ultraviolet light also known as blue light.

UV light is naturally present in sunlight but is also produced by digital screens such as TV, computers, laptops, smartphones, tablets, and LED lighting.

UV rays present in sunlight is the signal for the human body to be awake. It helps to maintain our normal sleep cycle. When the sun goes down, the signals to the brain are automatically cut off, resulting in production of the sleep hormone also known as melatonin, which slowly helps you to drift off to sleep.

When we use phones late at night, it signals the brain to hold the release of melatonin, therefore we feel more active and alert and unable to fall asleep. This  disturbs the sleep cycle and worsens the quality of sleep. Sleep deprivation can be very detrimental to our mental and physical health.

Risk and side effects

According to studies, these are the effects of blue light on our eyes.

  • Macular degeneration
  • Digital eyestrain
  • Disturbance in the sleep cycle
  • Dry eye

Protecting yourself from the harmful effects of blue light

  • Practising the 20/20/20 rule. It suggests keeping away your focus after every 20 minutes from the device at another object placed 20 feet away for at least 20 seconds.
  • Keep your eyes moistened using artificial tears or eye drops
  • Use the right prescription contact lenses or glasses.
  • Adjust the background light of your device, switch over to night mode settings, and use anti glare glasses.

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