The important member of the discount prescription glasses is the lens. The materials of lenses are divided into resin lenses, glass lenses, PC lenses, etc.

Currently, resin lenses are the most commonly used on eyeglass mart. Although glass lenses have high clarity, they are fragile and have a lower safety factor compared to resin lenses.

PC lenses also have a name called Cosmic Lens, which is not very tall. Its characteristics are strong impact resistance, lightweight, and mostly used for sporty discount glasses. The disadvantage is that it is easy to peel off the film.

The refractive index, In the process of matching glasses, the exact refractive index of the lens to choose depends on the specific degree, pupil distance, and size of the frame.

The higher the refractive index, the thinner and lighter the lens, and the higher the price. However, relatively speaking, the hardness of the lens will be lower. Conscience shop assistants usually recommend the appropriate refractive index based on your degree, so when matching lenses, it is not better to have more expensive lenses.

The composition of glasses consists of two parts: a frame and a lens. In terms of lenses, selecting the appropriate refractive index results in thinner lenses and lighter weight.

In terms of frames, you can choose ultra-light frames, but don't choose too large frames. For myopia lenses, the middle is thin and the edge is thick. The larger the frame, the larger the lens, and the thicker and heavier the edge lenses. Therefore, the secret to wearing ultralight glasses is a small and light frame with a high refractive index.