What is Blue Light, and Does It Affect the Eyes?

Each type of light on the spectrum has a different wavelength. Blue light is a short-wave, high energy form of visible light.

As the use of digital devices and screens increases, so has the mention of blue light. While there is no shortage of opinions on the potential harm from blue light, more research is needed to determine its effects conclusively.

Some sources believe blue light can potentially cause damage in humans. However, studies are lacking in showing any definitive damage. So, should you be worried about blue light and too much screen time?
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Continue reading for an examination of blue light, its effects, and how you can reduce eye strain. 
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Where do you receive blue light exposure?

Your greatest exposure to blue light is through sunlight. In addition, other sources of blue light include

• Computer monitors
• Smartphones and tablet screens
• Flat screen LED televisions
• LED lightbulbs

Blue light exposure from digital devices is less than the exposure you receive from the sun. However, the concern remains that some people spend several hours every day staring at digital devices and getting blue light exposure. 
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Does blue light damage the eyes?

According to a journal article published in Ophthalmology and Therapy, certain exposure to blue light, depending on the wavelength and intensity, caused a photochemical reaction in most eye tissue, especially the cornea and retina, in some invitro studies. Researchers theorize that the reaction may cause temporary or permanent damage to the structures of the eye, especially the retina.

However, the article also stated that currently, there is no evidence to suggest that normal exposure to blue light will damage the eye, including the retina.

The American Academy of Ophthalmology also states there is currently no evidence that blue light exposure will damage the eyes.
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Does blue light have any effect on the body?

Blue light in itself may not be causing any eye or vision problems. However, staring at digital devices for long periods can lead to a few adverse effects, such as the following:

Dry eyes: Using digital devices for excessive amounts of time can increase the risk of dry eyes. For individuals who already suffer from dry eyes, digital device use can make it worse.

Digital eyestrain: Prolonged screen time can also lead to eye strain. In addition to dry eyes, this may cause blurred vision, light sensitivity, and sore, tired eyes.  

Poor sleep: Exposure to light from screens can impact melatonin production. Melatonin is a hormone that sends a signal to your body that it is time to sleep. When your body is exposed to light, melatonin becomes suppressed. Your body doesn't know if the light is from natural sunlight or a device like your smartphone.
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Reducing eye digital strain 

It appears digital devices, such as computers and smartphones, will be a constant in most of our lives for the foreseeable future. While more research is needed to determine if blue light can potentially lead to eye problems, digital eye strain can cause discomfort. You can take steps to reduce your risk of digital eye strain and give your eyes a break.

Use artificial tears: Using artificial tears can help improve dryness and keep the eyes moist.

Practice the 20/20/20 rule: This involves looking 20 feet away from your screen for 20 seconds every 20 minutes.

Consider omega-3 supplements: Omega-3 supplements can help decrease inflammation and may also help promote tear production, which may combat dry eyes.

Drink plenty of water: Drinking plenty of water can help support adequate tear production.

Reduce screen time if possible: Consider taking time away from your digital devices when possible. Go outside, exercise, and enjoy your friends and family.

As always, one of the best ways you can keep your eyes healthy and promote good vision is with regular eye exams. If you would like to ask whether an appointment with one of our eye doctors would be appropriate at this time, call our office at 508-746-8600.