Do glasses have a functional coating and anti-blue light glasses lenses? Based on my experience, a pair of lenses with oil and dust resistance functions is necessary. Firstly, it can avoid the embarrassment of accidentally touching a large piece of dirt on the lens, and secondly, it can be easily wiped clean after being dirty.

Resistant blue light glasses are not necessary, as these lenses are designed for people who have been facing the screen for a long time. While preventing blue light, they can also cause the object's color to turn slightly yellow. Students who have requirements for accurate color in their daily studies and work should use it with caution, while other friends can purchase it according to their needs.

The refractive index not only affects the thickness but also relates to the dispersion of the lens. In actual effects, the greater the degree of Abbe, the more significant the impact. The smaller the Abbe number, the more severe the impact on edge clarity, especially the edge viewing angle of height glasses. Wearing glasses is to improve the clarity of the visual object as much as possible, so it is necessary to choose lenses with high Abbe numbers as much as possible. For comfort, I still chose lenses with higher Abbe numbers, although the price will also be higher.