We have this feeling when we optometry and opticians. When the optometrist gave me a test after giving me a test, we found that it was a little uncomfortable, and then it was reported to the optometrist. The optometrist gave you a lower level of power. , I found that the view is not clear. This is a change of 25 degrees. After the increase, the overcorrection reduces the undercorrection. According to the current industry situation, only the lens can be compromised by choosing a relatively comfortable lens, but there is 12 degrees. The optimization of the lens can take an intermediate value between 25 and 50 degrees, so that things can be seen clearly and the eyes will not be uncomfortable.

     ±25 degrees Most human eyes can basically adapt, but there will be some unsuitable situations, such as people with extremely sensitive eyes, people with abnormal optometry, people who pursue high-quality vision, such as designers, painters, financial accounting, etc.