Meridian-Varying Ophthalmic Lens Profiles for Myopia Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional ophthalmic lenses for myopia and presbyopia correction can cause visual side effects such as halos and require unnecessary accommodation, and existing myopia progression control lenses do not effectively prevent myopia progression without compromising distance vision.
Innovation Solution
Designing ophthalmic lenses with varying radial curvature power profiles along different meridians, including an optic zone with continuous and distinct curvature power variations to provide both distance and near vision correction, while minimizing unwanted visual effects and promoting natural accommodation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional lenses are used for myopia correction, then distance vision is fully corrected, but visual side effects such as halos occur and myopia progression is not controlled
Solution Approach 1:
The lens applies different curvature power profiles to different regions and meridians. The optic zone has a first radial curvature power profile while the peripheral zone has a second radial curvature power profile, creating localized optical effects to control myopia progression without compromising distance vision or causing halos.
Solution Approach 2:
The lens is divided into distinct functional zones: an optic zone for distance vision and a peripheral zone for myopia control. Each zone has different curvature power characteristics, allowing simultaneous achievement of distance correction and myopia progression control without visual side effects.
2Adaptability or versatility
If bifocal or progressive lenses are used for presbyopia correction, then both distance and near vision are provided, but the lenses are complex and require multiple regions
Solution Approach 1:
The single lens design provides multiple functions: the optic zone corrects distance vision while the peripheral zone with different curvature power profiles controls myopia progression and provides near vision accommodation, eliminating the need for separate bifocal or progressive lens regions.
Solution Approach 2:
The lens combines distance vision correction, myopia progression control, and near vision accommodation into a single integrated structure, merging the functions that would traditionally require separate lens zones or multiple lenses.
3Reliability
If lenses with add power regions are used to induce myopic defocus, then myopia progression is controlled, but halos and visual side effects increase
Solution Approach 1:
The lens uses continuous variation in curvature power parameters across different meridians and zones. By carefully controlling the radial curvature power profiles in the optic and peripheral zones, the lens achieves myopic defocus for progression control while minimizing halos through optimized parameter transitions.
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 lenses provide effective myopia progression control and improved vision comfort by reducing halos and fatigue, offering extended depth of focus and accommodating flexibility for both distance and near vision without compromising image quality.
Implementation Method 1
Conventional lenses (e.g., spectacle lenses and contact lenses) for correcting myopia reduce the convergence (for contact lenses), or cause divergence (for spectacle lenses) of incoming light from distant objects before it reaches the eye, so that the location of the focus is shifted onto the retina.
Implementation Method 2
In a presbyopic eye, the crystalline lens does not change shape effectively to accommodate for near objects
Data Source
AI summary
An ophthalmic lens (101), methods of manufacturing such a lens (101), and methods of designing such a lens (101) are described. The lens (101) includes an optic zone (103) centred on an optical axis (102) and a peripheral zone (105) surrounding the optic zone (103). Within the optic zone (103), along a first meridian (107a), the lens (101) has a first radial power profile that varies continuously in a first radial direction from the optical axis (102) to the peripheral zone (105). Along a second, different meridian (107b), the lens has a second, different radial curvature power profile that varies continuously in a second radial direction from the optical axis (102) to the peripheral zone.