Different Wavelengths have Different effects
There is an increasing awareness that blue light has significant impacts to our circadian rhythms and sleep. Blue light in the range of 460-480nm has been shown to have the strongest impact on the sleep hormone Melatonin being secreted at night.
Blue light also exists in the 415-455nm range. This has less an effect on circadian rhythm, Melatonin secretion, and sleep, but has more long term serious impacts to eye health.
Blue light is in this range is harmful, because it's the highest energy wavelength of visible light. This energy is able to penetrate all the way to the back of the eye, through the eyes' natural filters, killing cells in our retinas which causes permanent damage to our sight. The effects of this blue light are cumulative and can eventually lead to serious eye diseases like macular degeneration.
Technology and its impact on Eye Health
Even though blue light is nothing new, the biggest emerging issue is the amount of blue light exposure that we get on a daily basis through digital device use. Our modern lifestyles sees us being constantly exposed to smartphones, tablets, computer screens, and big screen TVs for the large part of the day (and night).
Over-exposure to blue light in this range has also been shown to cause a number of other issues such as headaches, dry eyes, and eye strain.
Solutions: How to protect your eyes
So what can we do about this? The simple answer is to avoid blue light in this harmful range as much as possible. However we understand in today’s world blue light exposure from electronic devices is unavoidable; therefore we recommend the following strategies to protect your eyes:
- Place a blue blocking screen filter on your phone – this reduces your expose to this harmful range of blue light when using you smart phone. We have a range of screen filters for purchase here.
- Use a set of blue blocking glasses
for day time use we recommend the Pavoscreen Blue blocking computer
glasses, these block the harmful range without distorting the colour you see. Perfect for people who are using computers or tablets all day.
- For night time use we recommend UVEX Blue Blocker Glasses, these are the ultimate Blue Blocking glasses which are perfect for watching movies at night or when working on computers/tablets past sundown.
- 20-20-20 Rule - after every 20 minutes, the computer user should take a break for at least 20 seconds and look at objects that are 20 feet away. This has been shown to significantly reduce eye strain caused by prolonged exposure to electronic devices.