Starting from the perspective of the details of each pair of discount prescription glasses, we strive towards the goal of creating glasses that are infinitely close to perfection. It is also a summary of the improvement of one's work quality.

The pupillary distance measured in daily life is usually for distant use, and when viewed up close, the human eye normally has adjustment and cohesion, so the pupillary distance for close use is smaller. Glasses specifically designed for close-range viewing should have close pupil distance.

Pupillary distance is the total distance between the left and right pupils, and some people have different distances between the left and right pupils. It is more accurate to measure and process according to different distances between the left and right pupils, especially for high myopia and functional discount prescription glasses lenses.

For glasses designed for long-distance viewing, the actual processed pupil height should be higher than the actual distance pupil height. For glasses specifically designed for close-up viewing, the pupils will be slightly lower if they are higher.

However, for everyday discount prescription glasses, it is necessary to simultaneously see far, medium, and near, so we need to take care of them, make choices, and weigh them all.

We also need to consider the size of the distance between the eyes. A smaller distance between the eyes can reduce downward movement, and glasses with a larger distance between the eyes are easier to scan the bottom part of the lens, making it better to see at medium distances. Therefore, it is sufficient to see both far and close.

Otherwise, if you directly use the far eye height, it will be troublesome to look up close. This is a mutual choice, weighing the pros and cons, and also a relatively scientific approach. They are all made according to the actual pupil height, as far, medium, and near have already been considered in the lens design.