Multizone Contact Lens Optics for Myopia and Accommodation Lag
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Solution Overview
Problem
Existing methods for correcting myopia, particularly in progressing myopic eyes, fail to adequately address the lag of accommodation, leading to blur and potential eye growth stimulus, and compliance issues with spectacle lenses are common.
Innovation Solution
A contact lens design featuring an inner optic zone with a positive add power to eliminate lag of accommodation and an outer optic zone for distance vision, with optional additional positive power sub-zones to manage myopia progression, ensuring alignment with the eye for consistent correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If single-vision contact lenses are used to correct myopia, then distance vision is improved, but lag of accommodation occurs and myopia progression is not controlled
Solution Approach 1:
The contact lens is divided into multiple optic zones with different refractive powers: a central zone for distance vision correction and peripheral zones with different add powers to address accommodation lag and control myopia progression. This segmentation allows simultaneous correction of multiple visual defects that would otherwise require separate lenses.
Solution Approach 2:
Different regions of the contact lens are designed with locally optimized optical properties. The central area provides distance correction while peripheral areas provide varying degrees of plus power to specifically address accommodation lag in different zones, creating a non-uniform but functionally optimized optical profile.
2Measurement precision
If spectacle lenses are used to correct myopia, then vision is corrected, but compliance is poor and cosmetic appearance is compromised
Solution Approach 1:
The patent replaces the mechanical spectacle lens system with a contact lens system that directly contacts the eye. This substitution eliminates the need for frames and lenses that can be lost, misplaced, or cause cosmetic issues, while maintaining the vision correction function through direct ocular contact.
3Adaptability or versatility
If multifocal contact lenses are used, then both distance and near vision are corrected, but manufacturing complexity increases
Solution Approach 1:
The multifocal contact lens is segmented into distinct optical zones (central distance zone, intermediate zone, and peripheral near zone) with specific refractive powers. This segmentation allows each zone to be optimized independently while maintaining overall manufacturability through controlled variation in lens parameters rather than completely different lens designs.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The contact lens effectively reduces lag of accommodation and manages myopia progression by ensuring clear vision at all distances, improving compliance and potentially slowing down myopia development.
Implementation Method 1
The contact lens includes an inner optic zone and an outer optic zone. The outer optic zone includes at least a portion with a first power, selected to correct distance vision.
Data Source
AI summary
A contact lens and a method for treating an eye with myopia is described. The contact lens includes an inner optic zone and an outer optic zone. The outer optic zone includes at least a portion with a first power, selected to correct distance vision. The inner optic zone has a relatively more positive power (and add power). In some embodiments the add power is substantially constant across the inner optic zone. In other embodiments the add power is variable across the inner optic zone. While in some embodiments the inner optic zone has a power designed to substantially eliminate lag of accommodation in the eye with myopia, in other embodiments, the add power may be higher.