What is Blue Light?

Although blue light is considered environmentally friendly, blue light can cause several health issues and affect your sleep and more.
Before the invention of artificial lights, Sun was the only source of blue light, and people used to spend their evenings in darkness, but, at present, the evenings are illuminated all over the world and are artificial lights available everywhere globally; therefore, we take them pretty much for granted. We are also paying the price at the same time.
This article will give you a detailed overview of blue light and how it can have adverse effects on your health and eyesight. 

What is Blue Light?

Blue light is a visible color of the light spectrum seen by a human eye.
Blue light has a shorter wavelength, which produces more energy,
Blue light is considered harmful because many studies show that blue light can cause eye strain, sleeplessness, fatigue, and headaches.

blue light spectrum health
Artificial Blue Light

Natural Blue Light vs Artificial Blue Light

The blue light wavelengths surround us, and it is found everywhere. You might not have known, but they are why the sky appears blue to us. 

The blue light has shorter wavelengths that collide with air particles and cause the blue light to scatter, due to these scattered wavelengths of blue light, our eyes process the sky as blue. It also impacts regulating the body’s sleep and wake cycles, also known as the circadian rhythms. 

Blue light also plays a vital role in boosting your alertness and elevating your moods, it can also increase your reaction time and your overall well-being. There are some artificial sources of blue light, including electronic devices and other lighting types.

How Blue Light Affects Our Eyes?

Blue light affects your eyes in several ways; blue light can easily pass through your cornea and the lens of your eyes to reach the retina.
This light can have adverse effects on your vision and can prematurely age your eyes.
Research shows that too much exposure to blue light leads to the following problems:

Digital Eye Strain

Blue light emitted from digital screens and computer devices can lead to digital eye strain as it decreases the contrast. Symptoms of eyestrain are sore eyes, itching, and difficulty in focusing.

Retina Damage

There are some studies according to which exposure to blue light for an extended time can cause severe damage to your retina cells. As a result, you will face several eye-related problems like nearsightedness, farsightedness, astigmatism, age-related macular degeneration, etc.

Muscular Degeneration

As discussed earlier, blue light penetrates all the way to Retina, and if you are exposed to blue light for an elongated time, then it can damage the light-sensitive retina of your eyes.
As a result, several changes occur in your eyes that are very similar to those of muscular degeneration, and sometimes it may lead to permanent real loss.
Many eye care specialists suggest that added blue light exposure from smartphones, computer screens, and other electronic devices can increase your risk of muscular degeneration later in your life; Therefore, we recommend wearing computer glasses as long as you are in front of a computer.

How Blue Light Affects Our Eyes

Blue Light And Sleep

Talking about circadian rhythms, they are a bit different for everyone. The average length is about 24 and one-quarter hours and people who stay up late at night have a slightly longer circadian rhythm. However, people who sleep early fall short of 24 hours in their circadian rhythm. 

According to Dr. Charles Czeisler of Harvard Medical School’s research, daylight keeps a man’s internal clock aligned with the environment. 

Many studies suggest that exposure to any kind of light can suppress the secretion of melatonin in your body, but blue light exposure at night does it more powerfully. The research conducted by Harvard in which they compared the effects of 6.5 hours of blue light with the green light at comparable brightness, the blue light suppressed the melatonin twice compared to the green light and increased the circadian rhythms by twice as compared to green light. 

Another study was conducted at the University of Toronto, researchers compared the melatonin level of people exposed to blue light indoor and wore blue light blocking glasses with people exposed to regular dim light without wearing any goggles. The results were pretty surprising because both groups had almost the same hormone levels. 

It strengthened the hypothesis that true light is a potent suppressor of melatonin, the study also concluded that shift workers and people who stay up late at night could protect themselves if they wear glasses that block the blue light.
Many people think that inexpensive glasses with orange-tinted lenses can block blue light, which is quite true, but the drawback is that they also block other colors, so they cannot be used indoors at night.

If you want to protect yourself from blue light at night, then you have to follow the tips given below:


  • If you are using a night light, make sure that it is red. There are fewer chances of a shift in Circadian Rhythm and melatonin suppression with a red light.
  • Make sure to stop looking at bright screens at least 2 to 3 hours before bed.
  • If you are having the night shift at your work or use electronic devices frequently at night, consider wearing blue light blocking glasses or using applications that filter the blue wavelength at night.
  • During the daytime, make sure to expose yourself to lots of bright light. It will Boost Your ability to sleep at night and promote melatonin production in your body. It also improves your mood and alertness during daylight.

Concern About Blue Light Exposure

Although blue light has the shortest wavelength, it has the highest energy in the light spectrum. If you compare it with other types of weaker wavelengths, then the blue light is flicker and longer; due to the flickering, it casts a glare and reduces your visual contrast; it also affects the clarity sharpness. As a result, you suffer from eye strain, mental and physical fatigue, and headaches when you use electronic devices or sit in front of digital screens all day.
Our eyes do not have any mechanism to provide filters against this type of artificial light, or no, they are evolved to do it. So if your eyes are exposed to blue light for a long time, you can suffer from muscular degeneration and permanent vision loss. The medical experts are researching the safe exposure level of blue light for adults and children, so we give you some interesting stats are as follows:

  • 43% of adults do a job in which they need to use a computer or tablets for a prolonged time.
  • 74% of teenagers from 12 to 17 use electronic devices more frequently.
  • 70% of people that use electronic devices regularly have the symptoms of digital eye strain
  • 93% of teenagers have access to computers that emits blue light

How Can You Protect Your Eyes From Blue Light?

When you have to use computers, mobile phones, and other digital devices, you will be prone to blue light all the time. There are some methods by which you can reduce blue light exposure.

Reduce Screen Time

Try to reduce the time that you spend in front of screens, take frequent breaks when you are using computers so that your eyes can have adequate rest.  

Computer glasses

Computer glasses are very beneficial in reducing blue light and digital eye strain’s adverse effects. If you use computers for extended time periods, then it is recommended for you to have a pair of computer glasses to protect your eyes. 

Anti-Reflexive Coating

If you wear eyeglasses or prescription glasses, you can add an anti-reflective coating layer to your lenses. This coating will help you block a bit of the blue light and keep your eyes safe from its negative effects; our recommendation is to wear glasses that are designed for protection from blue light

Final Verdict

Blue light has both harmful and useful effects on your body. Although it has a positive side, exposure to blue light should be minimal as the negative effects are much more serious, you need to take extra care of your eyes and protect them from blue light because blue light can cause many vision-related problems, and in some cases, permanent loss of sight could occur. 

To protect your eyes from blue light, you can use plenty of eyewear depending upon your usage.

At Munnel you can find a wide range of blue light filtering eyewear products. 

We got everything needed to protect your eyes from the blue light, from computer glasses to anti-reflective coatings and blue light filters, our products are developed using the most advanced and latest technology to ensure our customers’ maximum safety. We recommend you to check out our latest collections of eyewear and sunglasses.