The common eyeglass lens materials on the market are mainly the following:
1. Glass lens
It has advantages such as high transmittance, high refractive index, and stable Abbe number, but its disadvantages are also obvious, such as fragile and heavy, and it is generally not recommended for children and athletes.
2. Resin lens
It has the advantages of light weight, not easy to break, and impact resistance, and is one of the most widely used lens materials. But its disadvantage is that its wear resistance is not as good as glass lenses and it is easy to scratch.
3. PC lens
Also called space lens, it has the advantages of ultra-light, impact resistance, and not easy to break, and is suitable for children and athletes. But its disadvantage is that the transmittance is slightly lower than that of glass and resin lenses, and the price is relatively high.
4. MR lens
Also called smart color-changing lens, it is a lens with photosensitive color-changing function. It is colorless or light-colored indoors, turns dark in the sun, and can be restored to transparency when not needed. Its advantages are convenience, practicality, and no need to wear two pairs of glasses, but its disadvantages are high price, easy to fade, and the color change effect varies from person to person.
5. Progressive lenses
Also called progressive multifocal lenses, it is a lens with multiple focal points. The upper part of the lens is the far-sighted area, the lower part is the near-sighted area, and the middle part is the medium-distance area, which can meet the vision needs of different distances. Its advantages are that it can reduce the frequency of replacement of glasses and is comfortable to wear, but its disadvantages are that it is expensive and it may take some time to adapt to the first wear.
In summary, no lens material is perfect, and each material has its advantages and disadvantages and applicable population. When choosing lenses, you should consider your vision needs, living habits, economic conditions and other factors comprehensively. It is recommended to have a comprehensive eye examination before fitting glasses, listen to the advice of professional optometrists, and choose lenses that suit you.
