The parameter used to measure the clarity of discountglasses is - Abbe number. The higher the Abbe number, the clearer the image. The lower the Abbe number, the more blurry the image becomes.

The higher the refractive index of the lens, the lower the Abbe number. The Abbe number is mainly determined by the material of the lens itself. Some brands use auxiliary additives to optimize the Abbe number when making lenses. Currently, there are also a small number of lenses in the eyeglass mart that can almost balance Abbe number and refractive index.

If your degree is high: you can prioritize the lightweight effect and choose lenses with higher refractive indices, but do not overly pursue them. If the degree is low: it can be paired with a slightly higher Abbe number, after all, seeing things visually is the key.

Is there a standard for selecting lens materials? No, it is also selected based on needs and budget. The materials of lenses mainly include glass and resin, among which resin materials are further divided into thermoplastic materials and thermosetting materials.

Unlike frames, the lens market is relatively uniform in terms of choice. In recent years, resin lenses have become increasingly popular, and most people choose thermosetting resin lenses.

The performance of thermosetting materials is relatively balanced in all aspects. Although PC chips are not very wear-resistant, they are already coated with a film to strengthen them when leaving the factory on the market, so there is no need to overly care about this issue when choosing.