With the actual technology it is possible to make your glasses thinner. This results in an aesthetic result. Thinner glasses are always deliverd with a anti-mirror coating because otherwise their would be a incommodious shadowimage. From +/- 2.50 it is necessary to make your glasses thinner.



The thickness of your glasses are displayed with a refractive number (refractive index). How higher the number, how thinner the glass. In a small frame a low index can be fine, in a big frame it is better to take a higher index because the glass will be thick on the side or in the middle.
A normal glass has a refractive index of 1.5. You can choose how thin your glass has to be: 1.5 or 1.6 or 1.7 or 1.8 and even 1.9!
The last index (1.9) is only possible on real glass and is very expensive. The highest number that can be reached on plastic glasses is 1.74. From 1.7 the glasses are automatically delivered with a anti-mirror coating. A thinner glass is also a more expensive glass.