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What is a blue light filter and who should use it?
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Blue light is one of the colors in the visible light spectrum. The others are red, orange, yellow, green, indigo and violet. When combined, they create white light. When the sun shines during the day, for example, this is natural white light.
However, at night, exposure to blue light can cause sleep problems by altering the circadian rhythm, which is the body's internal clock. Additionally, research suggests that excessive exposure to blue light can also cause eye strain.
What is a blue light filter and who should use it?
In a more natural environment, one in which we are exposed only to sunlight, our retinas perceive when the sun sets and the environment becomes darker. This induces the hypothalamus to begin the process of producing melatonin and other sleep hormones and reducing body temperature.
All artificial light, including incandescent bulbs, can disrupt normal sleep patterns. However, this problem is even greater with the blue light emitted by fluorescent and LED lights, such as those on the screens of many devices.
One of the reasons is that blue light has a shorter wavelength and higher energy: 400 to 490 nanometers. Therefore, in addition to sleep, exposure to blue light can affect the retina. Therefore, given that our routines are strongly linked to computer screens, cell phones, tablets and other devices that emit blue light, it is important to take some precautions.
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What is a blue light filter?
A blue light filter protects your eyes from the harmful effects of blue light. These days, many people spend at least seven hours a day looking at digital screens. Therefore, blue light filters are common and native in a series of technological products, in addition to glasses with this type of protection.
When it comes to electronic devices, enabling a blue light filter means adding a layer of color to your screen by adjusting the color temperature to a warmer tone. This reduces the amount of blue light emitted by the device, changing it to a more yellowish or amber color.
Similarly, glasses with lenses that filter blue light often have a yellow or amber tint incorporated into them. Unlike reflective lenses, which only block about 10% of blue light, most lenses with blue light filters filter out at least 35% of blue light. The more blue light a lens blocks, the more orange it appears.
On the other hand, it is important to mention that some studies have been carried out on the benefits of these lenses – whether they really relieve eye fatigue and help with sleep quality. However, no significant improvement was found.
Who should use a blue light filter?
Although blue light filters can be beneficial for anyone who spends long hours in front of screens, they are not – and should not be – the only solution to maintaining eye health.
In other words, in addition to filters and lenses, it is important to adopt other types of eye care. Practices such as taking regular breaks, maintaining proper posture and practicing good screen use habits can have more impact than filters and lenses. In general, combining these practices with a blue light filter can provide greater reduction in eye fatigue and improved sleep.
Furthermore, if you are still suffering from eye fatigue or other similar problems despite the practices mentioned above, make an appointment with an ophthalmologist to ensure that your eyes are healthy.
What is a blue light filter and who should use it?
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What is a blue light filter and who should use it?