Auto-focusing Presbyopic Lens Gradient Power Design
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Solution Overview
Problem
High-cost progressive multi-focus lenses are unaffordable for many Chinese consumers with presbyopia, necessitating a more economical and practical solution for correcting light and moderate presbyopia.
Innovation Solution
An auto-focusing presbyopic lens design with a gradual thickness reduction from center to edge and increasing power from 0 D to +200 D, optimized for Asian facial features and daily viewing habits, using glass or high molecular materials, and manufactured through processes like demoulding, grinding, and coating to reduce production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If progressive multi-focus lenses are used to correct presbyopia, then visual correction effectiveness is improved, but manufacturing cost increases significantly
Solution Approach 1:
The patent changes the power distribution parameter from the conventional progressive multi-focus pattern to a simplified gradient pattern ranging from 0D to +2.00D. This parameter modification maintains the essential function of correcting presbyopia while significantly reducing manufacturing complexity and cost, making the lens affordable for light and moderate presbyopia cases.
Solution Approach 2:
The patent applies different optical powers to different regions of the lens, with the center having +2.00D power and the periphery having 0D power. This local differentiation allows the lens to provide appropriate correction for presbyopia while maintaining a simpler overall structure compared to progressive lenses, thereby reducing manufacturing costs.
2Reliability
If conventional progressive lenses are designed, then comprehensive vision correction is achieved, but adaptation difficulty increases for users
Solution Approach 1:
The patent implements a partial power distribution scheme, providing only the necessary +2.00D correction in the central region for presbyopia while keeping the periphery at 0D. This partial action approach reduces the complexity of adaptation compared to full progressive lenses while still effectively addressing the core presbyopia correction need.
3Reliability
If lens power is increased to correct presbyopia, then correction effectiveness improves, but lens thickness increases
Solution Approach 1:
The patent concentrates the +2.00D power specifically in the central region where it is most needed for presbyopia correction, while the periphery maintains 0D power. This localized power distribution achieves effective correction without requiring the entire lens to be thick, thereby controlling overall lens thickness.
Data Source
AI summary
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.