Mineral glass lens. Edge with 5 lines, similar as Corning. Photo Gray and Brown color .
Mineral spectacle lenses are lenses made of colorless and colored inorganic glass.
Benefits of mineral spectacle lenses for the wearer
* They have high and stable optical properties. * Resistant to scratches compared to organic eyeglass lenses. * A wide range of are available in the form of tinted, sun-protection lenses, including those with a fashionable mirror coating, as well as photochromic. * Optical coatings have better adhesion to the surface of mineral spectacle lenses. * High refractive index spectacle lenses solve the problem of thick spectacle lenses. The lenticular and aspherical surface design makes these spectacle lenses thinner, flatter, lighter. 
