Ophthalmic Lens Optimization for Accommodative Demand
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Solution Overview
Problem
Existing ophthalmic lens design methods fail to adequately consider the effect of object vergence and the eye's accommodative response, leading to incomplete compensation for oblique aberrations and eye fatigue, particularly in single-vision, progressive, and occupational lenses.
Innovation Solution
An optimization method that incorporates a new merit function accounting for user accommodation and object vergence to reduce oblique aberrations, using a volumetric object space and smooth thresholding functions to minimize blur and eye strain, thereby enhancing lens personalization and visual quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional lens design methods are used that consider only prescription and position, then manufacturing simplicity is maintained, but oblique aberration compensation is incomplete leading to reduced visual quality
Solution Approach 1:
The patent applies parameter changes by incorporating accommodation amplitude as an additional design parameter in the lens optimization process. The merit function is modified to include terms that account for different accommodation states (rest, intermediate, maximum), allowing the lens surfaces to be optimized for multiple viewing distances simultaneously. This enables better oblique aberration compensation across varying accommodation levels while maintaining manufacturability through systematic parameter integration.
2Manufacturing precision
If lenses are optimized for a fixed accommodation state, then manufacturing precision for that specific state is improved, but adaptability to different viewing distances deteriorates
Solution Approach 1:
The patent implements dynamics by designing lenses that adapt to different accommodation states. The optimization process considers multiple accommodation amplitudes (rest, intermediate, maximum) and optimizes the lens surfaces to perform adequately across all these dynamic states. This allows the lens to maintain visual quality whether the wearer's accommodation is at rest, intermediate, or maximum, effectively making the lens adaptive to changing viewing conditions.
Solution Approach 2:
The patent applies segmentation by dividing the optimization process into multiple accommodation states (rest, intermediate, maximum). Each state is optimized separately with appropriate weighting in the merit function, allowing the lens design to address specific visual requirements at different distances while maintaining overall performance across the full range of accommodation.
3Ease of operation
If accommodation is not considered in lens optimization, then device complexity is reduced, but eye fatigue increases due to incomplete aberration compensation
Solution Approach 1:
The patent incorporates accommodation amplitude as a key parameter in the optimization process. By including accommodation-related terms in the merit function (such as defocus errors at different accommodation states), the lens design automatically compensates for aberrations that would otherwise cause eye fatigue. This systematic parameter integration improves eye comfort while managing complexity through structured optimization.
Data Source
AI summary
Configuring ophthalmic lenses that reduce oblique aberrations based on a wearer's accommodative demand values is disclosed. The accommodative demand values include A_(rel−) and A_(rel+) depend on object vergence L. The accommodative demand values are considered to and ensure no or reduced eye strain to the wearer. An improved merit function Φ′ is calculated based on the accommodative demand values. In the calculation, accommodative term A is a smooth and continuous function of both the object distance L and the spherical component of the power error. This ensures the accommodative demand values are well below maximum relative accommodations available to the wearer to prevent eye fatigue. The calculation may also include a smooth and continuous thresholding function ƒ that optimizes the merit function. The calculation may also include evaluation of the power error associated with various object vergencies for every direction of sight.