Free Form Technology
All progressive lenses feature a reading power in the lower part of the lens. The upper part of the lens is used for distance vision, and the transition between the two zones – also known as the progression corridor – provides clear vision in the middle distance range. Due to the laws of physics, blurring occurs at the edges of this zone that may vary in its intensity depending on the quality of the progressive lens design and the degree of individualised fitting. The more individualised the calculation and production of a progressive lens, the smaller the peripheral areas of blurring become. This results in an improvement in vision and wearer tolerance.
A progressive surface is what is known as a freeform surface. At Carl Zeiss Vision small components of the surface are defined which are locally variable and lead to a smooth progressive surface. These surface components are adapted to the wearer’s prescription with the aid of mathematical calculations and are then produced. This means that the design of the lens can be individually tailored to the personal needs of the wearer.