Many of you may have spent more time at home due to the coronavirus and spend more time staring at computer and smartphone screens not only at work but also in your private time. In these times, blue light-cut glasses that can reduce eye fatigue are attracting renewed attention. In this issue, we focus on “blue light-cut glasses” and introduce recommended items!
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What is blue light?
Blue light is visible light that is as close to ultraviolet rays as possible. It is emitted from smartphones, PCs, LED lights, etc., and is called blue light because its wavelength is 380~500 nm (nanometer) and appears blue in color. The sky appears blue because this blue light hits air and water molecules in the atmosphere and diffuses. Blue light has the strongest energy of all the light that can be seen by the human eye, and since it puts a heavy burden on the eyes and body, guidelines from the Ministry of Health, Labor, and Welfare recommend “taking a 15-minute break after an hour of work on a display.
How does blue light affect the human body?
The negative effects of blue light on the human body are said to be “eye fatigue” and “poor sleep quality. But is that all?” However, we should not underestimate the effects of blue light, which can cause headaches, impaired vision, retinal diseases, and dry eyes. Poor sleep quality can also be a cause of fatigue, skin regeneration, and other problems. Although research is still in its early stages and various theories have been proposed, those who are actually experiencing eye fatigue and insomnia should definitely consider wearing spectacles with blue light-cut lenses as one of their countermeasures.
When choosing blue light cut spectacles, pay attention to the ” cut rate! The key to a comfortable life is to make a choice that suits your purpose.
Blue light cut lenses have a “cut rate,” and the higher the rate, the more blue light is blocked out. However, the higher the rate, the more yellowish the lenses become and the worse the vision becomes. For example, for daily use, around 25% is recommended for a natural-looking appearance, and 40-50% is recommended for prolonged use of PCs and smartphones. In addition, the cut rate of lenses handled by eyeglass specialty stores varies, but some are 60% or higher, which is suitable for smartphone and computer use in a dark room. Since this is a major factor related to the feeling of use, you should not fail to check the cut rate when making your choice.
