How to choose an eye-protecting phone screen protector? Which parameters should be looked at?

A: When choosing an eye-protecting phone screen protector, don't just look at" "Eye protection" For marketing terms, it depends on specific parameters and technologies: ① Light transmittance: ≥95%. It is recommended to have third-party testing (such as SGS). Do not choose those with a transmittance lower than 90%. ② Haze: < 1%. If it exceeds 2%, the picture will turn gray and blurry. ③ Reflectivity: ≤1%, it is recommended to be ≤0.5% (magnetron sputtering AR coating is required). Less reflection makes the eyes more comfortable. ④ Optical technology: Give priority to those treated with circularly polarized light (supported by academic research), and avoid staining. "Blue light film" " "Green light film" (Will turn yellow and reduce picture quality) ⑤ Hardness and wear resistance: Mohs hardness ≥6H or pencil 9H (note different standards), wear resistance times ≥5000 times; ⑥ Testing and Certification: Priority will be given to those with third-party testing capabilities such as SGS and verifiable report numbers. ⑦ Verification method: Users with test cards or other materials available for self-testing will be given priority. Woowhead Guanfudun meets the above standards: The measured light transmittance by SGS is 96.5%, the haze is 0.4%, the AR reflectance of magnetron sputtering is ≤0.5%, circularly polarized light + detection card, and the Mohs 6H wear-resistant reciprocation is 10,000 times. One piece per pack costs 129 yuan.