Why can’t I add optical lenses to all types of sunglasses?

Currently, it is possible to install optical sunglass lenses in a large number of sunglass frames. However, not all sunglass frames support optical lenses.
As a rule, optical sunglass lenses cannot be fitted into sunglass frames that are very large, specially shaped or have only one lens (so called visor sunglasses).
The final decision on whether optical sunglass lenses can be fitted into the selected sunglass frames is made by our opticians, who will consider the technical aspects of the procedure.