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What is blue light?


Today blue light is very much associated with computers and digital devices.  But did you know that the biggest source of blue light comes from natural sunlight? 


Recently, I’ve been spending more time online, (haven’t we all during these covid times..?) and have found that has impacted my eyes a little.  I experienced eye strain, along with dryness and tired eyes.   So, I was tempted to make a purchase of one of the fashionable blue-light glasses on the market.


But before I did, I investigated the topic a little further and so I hope these findings will help you.


Scientists have been researching the effects of Blue Light for almost 50 years. The most recent evidence is that only extreme and sustained exposure to blue light may cause damage to your eyes.


So here’s the biggest question, will blue light filters make a difference?

Many claims have been made about the benefits of Blue Light filters and blocking lenses. The Royal Australian and New Zealand College of Ophthalmologists (RANZCO) July 2019 Position Statement on Blue Light Blockers states:

"No evidence exists to suggest that normal environmental exposure to blue light, including those from digital screen technology, causes damage to eyesight. Filtering out the blue light from screens is not necessary for general use."


I recommend to read up on these details, I’ve attached the statement of RANZO and you can read more about this here.

Today we reach for our digital devices more than ever. Screen time seems to be all the time for some of us. It’s no surprise if your eyes feel dry or tired, especially if you work in front of a computer screen all day.



Specsavers has listed tools and tricks to help with digital eye strain.  I’ve summarized 3 tips for you below and you will find more information on blue light glasses here.


20-20-20: look at something 20 feet away for 20 seconds every 20 minutes — schedule regular breaks from screens

Concentrating reduces blinking, so blink often and stay hydrated with lots of water — drink, and blink 

Use the “night time” option on your devices and turn down the brightness level


Did you know?

1 hour outside on an overcast day projects 30 times more blue light than 1 hour in front of a screen?


In summary

  1. Only extreme and sustained exposure to blue light may damage eyes
  2. There is no strong evidence that blue light filters will improve your vision
  3. If you have symptoms of eye strain try the five suggestions above


A little guideline in case you were wondering.  In doubt, I never stop to consult an expert. 



Until next time,