sigvan 5-pack reading glasses blue light blocking,anti uv ray fashion square frame eyeglasses women men computer readers (5 mix, 0.5) sigvan <br>what is blue light? <br> <br>blue light has a short wavelength and is likely to scatter, causing fatigue of the ciliary muscles, which are the adjusting muscles that adjust the lens, and may cause eye strain. <br> <br>blue light can cause a wide range of risks including eye strain, sleep disorders, damage to the retina, dry eyes, stiff shoulders, and headaches. <br> <br>for those who operate smartphones and pcs or watch tv, it is recommended to take measures immediately with blue light blocking glasses. <br> <br> ● eye and body strain caused by blue light <br> <br>blue light generated from pc and smartphone monitors causes health problems such as eye strain. <br> <br>sigvan blue light blocking glasses protect your eyes from all the blue light and uv rays generated in daily life, and prevent various health hazards. <br> <br><br> <br>material:plastic, which has the characteristics of super lightness, abrasion resistance low friction coefficient and so on.<br> <br>note:<br> <br>due to the differences between different monitors, the picture may not reflect the actual color of the project. thank you!<br> <br>it is a size used for manual measurement and may have an error of 0 to 1 cm, which is normal.please refer to the actual size. <br> <br>we will do our best to solve any problems and provide you with the best customer services.<br> <br>thank you so much for support us!<br> <br><br> <br>how to care<br> <br>never wipe the lens when they’re dry.<br> <br>please use neutral detergent or soap water to clean, gently wipe dry with a clean soft cloth.<br>