Just one more thing...
Progressive lenses are the answer for people who do not see clearly close-up or far away, and who would rather not switch glasses each time. The upper part of the lens contains the refraction for distance vision and the bottom part has the refraction for near vision. In this way, the refraction steadily increases from top to bottom.
Since the refraction increases from top to bottom, there is a transition area in each multifocal lens. There will be some vision loss in this transition area. We can see clearly if we look through the middle of the lens, but we cannot see clearly when we look through the side of the lens. The progressive lenses in the ‘silver’ category have a much bigger blurry area than the lenses in the ‘gold’ category. The higher the medal, the better the design and the smaller the blurry area.
With every multifocal lens, you can choose between the lengths of this transition area. If the wearer only wants to move his or her head just slightly in order to read, we will opt for a short transition. If the wearer wants to move his or her head more downwards to read, we will choose a regular transition.
The progressive lenses made of plastic are Orgalit® lenses, and the ones made of mineral are Optolux® lenses.
You can choose different indexes, materials and coatings for these lenses. Various treatments can also be added: color, photochromic, polarized, eye care or driving.