The geometric center size of the eyeglass online frame should ideally be close to the distance between the pupils of both eyes. Considering that the blank of the lens must undergo center shifting and edge cutting before it can be mounted on the frame and placed in front of the eyes.

So the position of the pupil is best aligned with the geometric center of the eyeglass frame. If the center shift of the lens is very large, it may cause prism and other effects, affecting the comfort of wearing glasses.

After wearing eyeglass online, ensure the distance between the lens and the eyeball. If the lens is too far from the eye, not only will the optical effect change, but the wearer will also see the outside of the lens, causing difficulty in positioning.

If the lens is too close to the eye, the eyelashes will touch the lens, which not only causes the lens to blur but also produces irritation. Therefore, it is best to ensure that the distance between the lens and the eyeball is about 10mm after wearing glasses.

The angle between the front mirror surface of the glasses and the perpendicular line of the wearer's face is approximately 4 ° to 18 °. The size of the angle is related to the field of view.

Generally speaking, the upper part of the frame should not touch the eyebrows, and the lower part should not touch the face. If the frame cannot achieve the required forward tilt angle, it is recommended that the best place to buy eyeglasses is to adjust the nasal bridge or replace the frame.

The width of the eyeglass nose bridge is moderate. When selecting an eyeglass frame, you can check it yourself by keeping the head vertical and looking forward, and ensuring that the frame maintains a satisfactory position without any clamping of the temple.