Progressive addition lens and method for manufacturing thereof
A multi-focus, progressive technology, applied in glasses/goggles, optics, instruments, etc., can solve the problem that the use cannot be intuitive
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[0055] figure 1 A side view of the head of a user wearing glasses is shown. The spectacles comprise a frame 3 attached to lenses 4 , and temples 8 . Another lens and another temple are symmetrically attached to the right side of the glasses.
[0056] Some technical terms used in the procedures described below are first defined.
[0057] In anatomy, the Frankfurt plane FP is defined as the plane passing through the midpoint of the subject's inferior orbital rim and the superior border of the concha, which is the highest point of the skull of the ear canal, corresponding to the tragus of the ear point, the highest point of the tragus of the ear. The sagittal plane of the user's head is a plane that is orthogonal to the Frankfurt plane and passes through the middle of the two centers of rotation of the eyes.
[0058] figure 1 In , the user is considered to be in an upright position in which he exerts the least effort. figure 1 In , the user is considered to be sitting or st...
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