It is very difficult to estimate the goodness of a lens from a textual description, and the one provided for this article does not help to understand the details: the only technical data provided are the color and refractive index. I found, for example, that the width of the central channel of these progressive lenses, used when looking at mid distances, is definitely narrow: a deficiency that could not be inferred from the description. The price in any case is very reasonable and the service excellent (assembly of the full spectacles).