Multifocal Contact Lens Design Based on Pupil Dynamics
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Solution Overview
Problem
Multifocal contact lenses often fail to provide optimal vision correction for presbyopia as their placement and size are determined by general population statistics rather than individual pupil measurements under varying light conditions and focal demands.
Innovation Solution
A multifocal contact lens design where the size, position, and optical power of the central and outer areas are determined based on specific measurements of the patient's pupil size, reactivity, and movement under different lighting conditions and focal demands, allowing for personalized correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If multifocal contact lenses use placement and size determined by population statistics, then manufacturing and prescribing is simplified, but visual performance and correction effectiveness deteriorates due to lack of individualization
Solution Approach 1:
The patent performs preliminary measurements of the patient's pupil characteristics (size, reactivity, movement) under varying light conditions and focal demands before lens fabrication. This advance data collection enables customized lens design that is then manufactured according to these specific measurements, resolving the contradiction by individualizing the lens parameters while maintaining a systematic process
2Device complexity
If multifocal contact lenses use standardized design for all patients, then device complexity and prescribing difficulty are reduced, but adaptability to individual patient needs deteriorates
Solution Approach 1:
The patent applies local quality by customizing specific parameters of the contact lens (central area size, position, and optical power) based on the individual patient's pupil characteristics. Rather than redesigning the entire lens system, only the relevant local parameters are adjusted to match the patient's specific needs, maintaining simplicity while achieving adaptability
3Ease of manufacture
If multifocal contact lenses are designed without considering pupil reactivity and movement, then design and manufacturing is simpler, but visual performance under varying conditions deteriorates
Solution Approach 1:
The patent performs preliminary measurements of pupil size, reactivity, and movement under varying light conditions and focal demands before lens fabrication. This advance data collection enables precise customization of lens parameters that will later align with the patient's dynamic pupil behavior, resolving the contradiction between manufacturing simplicity and alignment precision
Data Source
AI summary
The present invention provides a multifocal contact lens comprising a central contact lens area having a size, a position, and an optical power; an outer contact lens area having a size, a position, and an optical power; wherein the size, the position, and the optical power of the central contact lens area and the outer contact lens area are determined according to a measurement of the size of the pupil under a first light condition, a measurement of the reactivity of the pupil under a varying light condition or a varying focal demand, and a measurement of movement of the pupil under a varying light condition or a varying focal demand.