Type of presbyopic lens
Abstract:
The present disclosure involves the field of optical lenses, and particularly a type of auto-focusing presbyopic lens for people suffering from light to moderate presbyopia. The lens employs a structure wherein the thickness gradually gets smaller from the center to the edge, and the power of the lens gradually increases from 0 D on the edge to +2.00 D in the center. The length of the progressive passage on the lens is 28-36 mm, the central thickness of the lens is 1.2 mm, and the peripheral thickness is 0.5 mm. In some embodiments, the central thickness of the lens may be 2.4 mm and the peripheral thickness may be 1.0 mm. The invention fully considers the facial features of Asians, and employs an appropriate minimum assembly height while the structure, wherein the thickness gradually gets smaller from the center to the edge, conforms to the daily viewing habits of the elderly population.
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