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From the historical beginnings of optics, the only material used to produce spectacle lenses was mineral glass. Until the mid-20th century, when CR39 was discovered, mineral lens production began to replace organic (plastic) lenses. At present, plastic lenses in all modifications make up 97% of the world’s production.
Mineral spectacle lenses
The mineral glass lens edger consist mainly of a mixture of so-called glass-forming oxides, the main component of the glass being silicon oxide. By adding other oxides such as lead or barium oxide, the refractive index of the material can be changed. By increasing the refractive index of the material, we can maintain the dioptric values ??and the diameter of the lenses when using less glass.
For the manufacture of mineral lenses, refractive indices of 1.5, 1.7, 1.8, 1.9 are used. The higher the refractive index, the harder the glass is and the higher the dispersion. For better imaging …