The upper light area uses 1.56 index to correct far vision (such as driving and looking at the long view), and the diopter ADAPTS to the user's far-sightedness needs .
Lower light area lens additional diopter (such as +1.00 to +3.00), for close reading or fine operation, dome or flat top dividing line design can reduce the sense of visual jump. 1.56 belongs to the low and medium refractive index, suitable for myopia below 600 degrees or presbyopia below 300 degrees .
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1.56 The practicability of bifocal lens is reflected in medium and low degree adaptability and economy . It is suitable for users who have limited budget and need to take into account near and far vision.

1.56 bifocal lens is designed by divisional diopter and medium and low refractive index material to provide an integrated correction program of far and near vision for medium and low degree users.
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