Priority to Pupillary Distance:
The points of convergence between the two disciplines are real through a common purpose, that of optimising the size of the lens; hence the fundamental importance given to PD from the start and respect for the eyebrows and cheekbones. Therefore aesthetic and corrective constraints come together. We have established a direct relationship between the size of the frame and the size of the PD, while giving the width of the hinge a fundamental role in the case of a small pupillary distance relative to the volume of the face.
This approach will have two important consequences directly related to the value of the correction:
• a weight reduction that improves the stability and comfort of the glasses.
• not causing an unsightly magnifying glass effect, if one needs to use glasses with a 1.5 index for image magnification that cannot be achieved with the use of glasses with greater indices.
This approach is all the more important in the case of image magnification using pre-calibrated glasses with a 1.5 index. Glasses with higher indices cannot address this issue.
And with the significant advantage of allowing a reduction in weight, thereby improving the comfort and stability of the client’s glasses.