Type of presbyopic lens
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.
1. An auto-focusing presbyopic lens comprising:
a structure including a plain zone and a presbyopia zone, wherein a thickness of the structure gradually gets smaller from a center of the structure to an edge of the structure,
wherein in the presbyopia zone, a power of the auto-focusing presbyopic lens gradually increases from 0.0 D on the edge of the structure to +2.00 D in the center of the structure, wherein the gradual increase occurs over a progressive passage length between 28-36 mm.
2. The auto-focusing presbyopic lens according to claim 1 , wherein the structure further comprises an upper side and lower side, wherein in the presbyopia zone the power of the lens gradually increases from 0.60 D on each of the upper and lower sides of the structure to +2.00 D in the center of the structure.
3. The auto-focusing presbyopic lens according to claim 1 , wherein the structure has a central thickness of 1.2 mm, and a peripheral thickness at the edge of the structure of 0.5 mm.
4. The auto-focusing presbyopic lens according to claim 1 , wherein the stated auto-focusing presbyopic lens includes a glass or high molecular material.
5. The auto-focusing presbyopic lens according to claim 1 , wherein the gradual increase in the power of the auto-focusing presbyopic lens occurs in increments of +0.01 D over the progressive passage length.