Blue light filtering glasses: how they can protect our vision


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Technology is advancing in leaps and bounds every day, our lives have been filled with LCD screens, we spend about 30% of our time in front of the computer or laptop, smartphone and even the television, but we do not take account how it affects our visual health. Although they may appear harmless, LED backlight modules in LCD displays emit a large amount of blue light, named for the cool tint it gives off. Blue light is part of the electromagnetic spectrum that the human eye perceives, it is emitted both by natural sources such as the sun and by artificial sources, especially electronic devices.

Regarding its wavelength, blue light is found below 400 nm (ultraviolet zone) and above 750 nm (infrared zone). This is why being exposed to it for a long time becomes dangerous for our eyes, because it can damage the photoreceptors and the cells of the retina. Some of the problems caused by prolonged exposure to blue light are:

Computer visual syndrome (SVI):

  • Reduced flashing frequency
  • Altered circadian rhythms

Due to its short wavelength and high energy, blue light partially suppresses the synthesis of melatonin, which is the sleep hormone, causing insomnia. Exposure to blue light without protection is dangerous to visual health, its effects are cumulative and chronic, and even cause complicated photochemical damage.

How to protect yourself from blue light

To protect our eyes from receiving a large amount of blue light, specialists have designed glasses with specific filters that reduce the excess of this type of light by lowering its intensity between 15 and 20%, thus helping to protect our vision. Many have wondered if these new filters really protect our vision or are just a way to sell the use of glasses, which is why various specialists have developed studies on this subject. In 2018, an optical chemistry survey showed that being exposed to blue light without protection can lead to macular degeneration, which is a degenerative and irreversible disease that leads to loss of vision.

Based on the investigation, glasses that filter both UV rays and blue light can be used, whether from a natural or man-made source. Likewise, other studies of blue light and the damage it causes show that there are populations at greater risk of developing visual conditions due to overexposure. That is why they recommend wearing glasses with special filters, especially for people with dry eye syndrome as well as users who usually use contact lenses.

Based on the results of these studies, manufacturers of sun filters or lenses claim that blue light glasses can relieve eye fatigue, improve the quality of sleep. In addition, these can also provide retinal protection against phototoxicity, especially with respect to the protection of the macula, which is why both optometrists and ophthalmologists recommend their use.

Types of blue light filters.

To protect you from exposure to blue light, you can find two types of filters depending on the color of the glass, the most common is the yellow-orange tone used in sunglasses, it absorbs blue light and helps to reduce visual fatigue.

However, transparent glasses have also been developed with filters that filter some of the blue light we receive, these are only to be used when we are in front of the screen.

The 3 types of blue filters are:

– Internal blue filters apply only to the lens mass and filter approximately 20% of blue light. These have the advantage of not producing reflections.

– External blue filters these are found on the surface of the lens, this type of filter alone can filter up to 20% more or less.

– Combined blue filters, this type combines the two filters, one filter on the mass and another on the surface, these glasses filter blue light about 30%, and it is generally recommended for people who, for work reasons, have to spend a lot of time in front of their computer or laptop.

Other methods to protect our vision from blue light

Although we can use the lenses with solar filter when we are in front of led screens, we must be aware not to overexpose ourselves to this light, that is why we must take a series of preventive measures: Reduce the hours you walk past screens of your devices, although we know that their use may be necessary for our work, it is important that we also pay attention to our vision.

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