When measuring the pupil height, after putting on the frame and looking straight, the salesperson's best place to buy eyeglasses points your pupil position on the temporary lens of your eyeglass frame. Then measure the height difference between your pupil position and the lowest point of the lens, which is the pupil height.

If the eyeglasses online cheap frame is large, the pupil height needs to be increased additionally. Because when wearing glasses, they will slide down a bit. If you need to push your glasses up frequently to see things clearly, one factor is that the lenses are too far away, and the other is that the height of the glasses is not right.

When the degree of the eyes is high, some stores may mistakenly match your pupil height to provide you with very thin lenses for aesthetics. This is by placing the center of the concave lens in the middle of the frame, so that the overall outer ring of your lenses is in the thinnest state, but the pupil height is incorrect.

I used to hate wearing glasses mainly because I didn't understand and searched a lot of information. If the degree is not too high and there are children, it is recommended to buy kids' eyeglasses online lenses, including axial position and pupil distance. Or if you know your degree is about what, buy the cheapest glasses online and try out all the ones with nearby degrees.

In the process of optometry, lens selection, and frame selection, you will encounter many professional vocabularies. As long as you understand the meanings of these words, you can make your own choices. The vocabulary related to lenses includes refractive index, wear resistance coefficient, spherical surface selection, Abbe number, anti-fouling ability, UV/blue light/radiation resistance, and brand selection.