If the cheapest eyeglasses are not clear and the eyes are constantly adjusting when looking far, it is easy to fatigue and involuntarily squint, squeeze the eyes, and produce or worsen astigmatism.

Once clear, it becomes easier for the eyes to see far, no longer adjust or lose sight, and the degree becomes stable. So, can we lower it when we look closer (within one arm's range)? Sure! As long as you can ensure that you can see up close clearly enough.

That is to say, in the case of using full correction at a distance, it is completely OK to decrease (in layman's terms, decrease the degree) by several tens of degrees and still maintain clarity at a normal distance.

If there are symptoms of eye fatigue such as eye soreness and swelling, the cheapest eyeglasses that are only close to the eye should be used because the older the age, the poorer the ability of the human eye to adjust. The specific degree to be added still needs to be determined through close range and inspection.

If you are only in your twenties and do not experience visual fatigue, there is no need to look closer. Because the adjustment force of the eyes is strong enough, it's like an adult carrying a watermelon without difficulty.

The premise of adding is to simply look closer, not farther. Some people are afraid that if the degree is matched enough, they may think it is easy to increase the degree, and then they are matched too low, so low that it becomes blurry when seen up close. Then stick to the screen to see, this is not advisable.