Buy Sunglasses

I want to buy some avators Ray-Ban. I will need the lenses to glasses. I already know the prescription can be added to the avators. Now I wonder if the Optometry completely replace the lenses or simply "add" to the current prescription lenses on sunglasses. Does anyone know?

I have worn glasses all my life if I can say without doubt that the prescription is constant in the glass, not "added" so that your doctor will simply replace the lenses that come with the part of your prescribed set lenses. A word of warning: DO NOT LOST THEIR! ;)

replace the lens, the lens is made to your prescription

They will replace the lens.