We will mainly explore how to choose prescription glasses lenses that are suitable for customers' eyes when choosing frame glasses. Is it enough for frame glasses to have the correct pupil distance and have a stylish and beautiful appearance? Everyone knows that frame lenses have spherical and aspheric surfaces (functional lenses and special lenses).

So what do customers know about spherical lenses? What are aspherical lenses? What is functional? What is the salesperson's understanding of nonball? Yes! You may say that displaying spherical and aspheric surfaces with props to customers is enough, but how do you know if customers are suitable for spherical or aspheric surfaces?

Some customers say 'I have an aspherical surface', but their understanding of aspherical surfaces is... lighter, thinner, and more realistic to see? Wait a minute.

Everyone knows that spherical lenses refer to lenses with both inner and outer surfaces being spherical or with one side being spherical and one side being flat. The center and rear edges of farsightedness lenses are thin, while the center of nearsightedness prescription glasses lenses is thin and both sides are thick.

Some customers say that if my diopter is relatively low, I can choose a spherical surface. In fact, this is not the case. The spherical surface is suitable for steep corneas, and there is not much corneal astigmatism in all directions. The diopter is not high, or there is not much demand for lens thickness in the heart, or the customer is not sensitive to peripheral differences.