The uniqueness of the human body is one of the many factors influencing product development today, with an increasing demand for products that can adapt to our anatomy.
An overall approach to the eyes and anatomy
Each patient has a unique face. If an eyeglass lens is not matched to the wearer’s facial measurements, they may not be able to utilize the full potential of their 3D vision, which is essential for good distance perception. Research shows that 50% of progressive lens wearers experience problems with either clear distance vision, peripheral distortions or limited 3D vision, and/or may also have difficulty judging distances.*
* External market research with 1,000 progressive lens wearers in Germany and USA (2014)
ZEISS Progressive Precision Superb responds to this challenge with a solution that provides an optimum match of the eye-lens-frame system.
The unique anatomy of every individual’s face is important.
FaceAdapt Technology optimizes the vision zones based on the exact position of the eyes and the facial fit of the frame on the nose and ears.
Taking into account the physiological position of wearer parameters allows an optimal match of the eye-lens-frame system and therefore full use of three-dimensional vision. FaceFit Technology optimises the vision zones based on the knowledge of the exact position of the eyes and the facial fit of the frame on the nose and ears.
FaceFit Technology optimizes the vision zones based on data for the frame, the position of the eyes and the fit of the frame on the nose and ears. With this precise information, lens zone sizes can be improved and the 3D vision potential fully realized.
Standard lens design optimized for a face with standard position of wear parameters:
Standard lens design on a face with non-standard position of wear parameters:
Lens design with FaceAdapt Technology on a unique face that is different from average dimensions:
No two faces are alike. Every nose, every ear is different. There is even a difference between the left and right eye. ZEISS Progressive Lens Precision Superb is precisely fitted to the following physiological parameters of the face:
In addition to the size and shape of the chosen frame, frame data delivers the final details for a customized optimum zone size balance and the resulting optical and aesthetic performance.
Fitting height and pupil distance
The correct fitting height allows any frame size and enables the lens to be designed accordingly. A precise measurement of the pupil distance ensures the perfect location of the near zone.
The pantoscopic tilt (the angle of the tilted lens vs. the vertical axis in the final position of wear) must be considered in the lens calculation in order to minimize optical errors and blurred vision.
Back vertex distance
Measuring the back vertex distance (distance between the cornea and the back lens surface) is the basis for simulating eye movement behind the lens and optimizing and sharpening the horizontal fields of vision.
h = Frame height
l = Frame length
DbL = Distance between lenses
YR/L = Fitting height right/left eye
z/PDR/L = Pupil distance right/left eye
PA = Pantoscopic tilt
BVD = Back vertex distance
By using i.Terminal® 2, the ZEISS centration system, all fitting measurements can be taken in a fast, simple and precise manner.