March 15, 2008 
Individual progressive glass lens from Carl Zeiss.
Gradal Individual Frame Fit
Left and right side of the face in each human are asimetric. That is an important reason for micrometar precision in making glass lens. Especially because the sensitive eye notices even the slightest differences so with time it will react to the complaint for lack of sharpness and fast waeriness. Only precize measurement and including individual data into form of the working surface of the manufactured lens can provide spontaneusly comfotable vision in all distances.
PD: pupilar siatnce for right and left eye is the distance of the middle of the pupil to the bridge of the ocular frame.The height of the zero view point: point in which the eye/left or right) looks through the glass lens while looking into distance.
The height of that point is measured from the lower part of the frame and while keeping the head straight. It is individually different in each person.
The act while looking very much depends abput personal habits.. Profession, hobbies but also your height or arm lenght have a significant influence on the habit of holding the reading material. With this measurement necessary for Gradal Individual Frame Fit manufacture of glass lenses there are also frame twist (tells how much degrees will the level of the lens be sloped to the vertical level) , frame curvature(the angle of curvature comes into the budget of the lens and its manufacture) and vertex distance of the glass lens and the eye (exact distance between the vertex points of the eye cornea and the internal surface of the glass lens).
Adjustment is completely spontaneus because each lens is precisely calculated and made by every demand for each eye. Individual glass lenses are so well adjusted to your needs thaht after a while you don’t even notice them anymore. Progressive lenses can now fit every frame. No matter is the frame quadrangular, rounded, small or even curved – with Gradal Individual Frame Fit lenses you can freely chose the glasses that fit you best. With the help of the inovative techological usages we will make your personal glass lenses with exact punctuality of 1/1000mm.