Usually when we buy a pair of glasses ask us what we want our lens material. Generally speaking organic or mineral lens, but other materials, we will see differences.
A mineral lenses also known as glass lenses, are lenses made primarily with fused silica with other metal oxides such as titanium, sodium, etc., depending on the specific characteristics we want, such as reducing the lens.
The reduction of the lens is related to the refractive index , the lowest rate that exists in the 1,523 mineral lens, the lens is therefore more basic. If we want a smaller lens will have to choose a higher rate, the next index would be 1.6, 1.7, 1.8 and finally we have the index 1.9 lens is smaller there. The problem of the reduction in mineral lenses is that they have added in manufacturing heavy metal oxides and this increases the weight. Therefore, in the more reduced mineral lens is a lens, despite having less thickness, will be a heavier lens.
Another point to note is that the optical quality of the lens is reduced below the lens of 1,523. A further reduction, lower quality optics. This is noticeable especially when we look at an object outside the visual axis in high-grade lenses reduced, where we see that the object has a kind of colored shadows, this is known as aberration spherical.
The big advantage of mineral lenses is your scratch resistance, as it is very difficult to scratch.
On the contrary, his great drawback is its weight , which is far superior to organic lenses. Another drawback is that when a glass lens can break easily if we drop the glasses. For this reason it is not recommended for children.
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