However, when light passes through different media, the dispersion coefficient varies, which inevitably leads to the term Abbe number (also known as dispersion coefficient). The cheapest eyeglasses online Lenses with different refractive indices have different dispersion coefficients.
The larger the Abbe number, the smaller the dispersion, and the clearer and more realistic the feeling of seeing things after wearing glasses. The human eye is also a refractive medium.
When choosing a lens, try to choose one with a high Abbe number. However, there is an irreconcilable contradiction between the Abbe number and the refractive index. Often, the larger the refractive index, the thinner the lens will be, but the Abbe number will be lower.
Professional cheapest eyeglasses online fitting is the process of finding perfection from imperfection, and there are too many things to consider when making specific choices.
I want to emphasize one point here: I have found that many people nowadays blame Abbe numbers for discomfort when wearing glasses. Is it because the Abbe number is different from before when wearing new glasses?
Because in fact, lenses with different Abbe numbers are not noticeable to people who wear glasses on a daily basis, and most people's lenses change from 1.6 to 1.67 or 1.74, which I believe you cannot feel!
The probability of discomfort in glasses caused by changes in Abbe number is low. If you feel uncomfortable wearing new glasses and haven't improved for two weeks, you should check the degree, pupillary distance, and pupil height.
When choosing lenses, since the eyes don't feel anything, what's the use of choosing lenses with Abbe numbers? Of course, it's useful, because most people wear the cheapest eyeglasses online for a lifetime, and it's essential to ensure the best visual quality possible over such a long period!
