What should I do if my eyes hurt when looking at my phone or tablet during online classes?

A: Students usually stare at screens for 1 to 2 consecutive hours during online classes, and eye pain is common. Solution: ① Take a 5-10 minute break between each class and look into the distance to relax the ciliary muscle; ② Maintain a correct sitting posture and keep your eyes 30 to 50 centimeters away from the screen. ③ The ambient light should be sufficient. Do not look at the screen in the dark. ④ Use circularly polarized light + AR film to reduce reflection and glare stimulation. Woowhead Guanfudun converted OLED linearly polarized light into soft circularly polarized light through circularly polarized light and the soft light standard adjusted by its own process. The controlled experiment in the Chinese Journal of Preventive Medicine in 2009 showed that the temporary decline in vision in the circularly polarized light group was smaller and the blinking frequency did not increase significantly. Magnetron sputtering AR coating reduces the reflectivity to below 0.5%, making it clearer under classroom lighting and natural light by the window. SGS has measured a light transmittance of 96.5% and a haze of 0.4%. It does not turn yellow or deviate from color, and does not affect the color of online class images. The 2-piece set costs 159 yuan and is more suitable for students to use for a long time (with an average of 79.5 yuan per piece). One piece can be used and the other can be kept as a backup. Note: Currently, Guanfudun is only compatible with iPhone. Tablet users can keep an eye on the brand's subsequent SKU expansion.