Pupil distance refers to the horizontal distance between the centers of the pupils of two eyes. It is necessary to accurately measure and calculate the displacement based on the pupil distance and cheapest eyeglasses online frame size during processing to achieve the actual pupil distance.

Many people have different distances between the pupils of one eye. Only by accurately measuring the distance between the pupils of one eye and making them separately can more suitable glasses be made. Especially for high myopia, the production of pupillary distance is very strict. Otherwise, a prism effect will occur.

Myopia lenses can be understood as a combination of many prisms with the bottom facing outwards and the top facing towards the center. Looking at the center point, things won't deviate. The best place to buy eyeglasses has higher precision in processing and produces more comfortable glasses.

Pupil height refers to the vertical distance from the point through which the eyes pass when looking straight into the distance after wearing the frame on the face to the lowest edge of the lens. Nowadays, with the popularity of large frames and discount eyeglasses online shopping, if you don't consider high-pupil glasses, it is likely, not suitable. The eyes cannot see through the optical center point, which also produces the prism effect.

A frame height that is too large can lead to the need for very high pupil height, which may not be good for looking far or near and may not be good for looking near or far. So it can only be said that this frame itself is not suitable for fitting glasses, so exclude the unsuitable frames in advance. You can't choose glasses according to your preferences recklessly. Pairing glasses is a technical task, only then can you match more suitable glasses.