Progressive Ophthalmic Lens for Myopia Correction
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Solution Overview
Problem
Conventional myopia correction methods, including progressive lenses, often lead to an aggravation of myopia over time due to inadequate adaptation for peripheral vision, especially in children and individuals with inaccurate near vision focus.
Innovation Solution
A progressive ophthalmic lens design featuring a far vision area, a near vision area, an intermediate area, and an upper peripheral vision area with varying optical power values, ensuring continuous correction for foveal and peripheral visions, reducing myopia aggravation by adapting to different observation conditions and eccentricities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional myopia correction lenses with uniform optical power are used for foveal vision, then central vision is corrected, but peripheral vision causes overcorrection leading to myopia aggravation
Solution Approach 1:
The lens applies different optical power characteristics to different regions: the central zone maintains full myopia correction for foveal vision, while the peripheral zone reduces optical power to prevent overcorrection. This spatial variation in optical properties resolves the contradiction between accurate central vision correction and harmful peripheral overcorrection.
Solution Approach 2:
The lens is divided into distinct functional zones (central zone and peripheral zone) with different optical power characteristics. This segmentation allows independent optimization of correction for foveal and peripheral vision, addressing the harmful overcorrection in peripheral areas while maintaining accuracy in central vision.
2Object-affected harmful factors
If progressive lenses with reduced myopia correction in peripheral areas are used, then peripheral overcorrection is reduced, but near vision focusing accuracy deteriorates
Solution Approach 1:
The lens provides location-specific optical corrections: the central zone maintains appropriate myopia correction for near vision tasks, while the peripheral zone applies reduced correction. This ensures that near vision activities (performed through the central zone) maintain focusing accuracy while peripheral areas benefit from reduced overcorrection.
Solution Approach 2:
The lens creates dynamic visual correction based on the wearer's gaze direction and focal distance. By maintaining full correction in the central zone for near vision while reducing peripheral correction, the system adapts to different visual tasks and prevents both peripheral overcorrection and near vision focusing defects.
3Ease of manufacture
If uniform myopia correction is applied across the entire lens, then manufacturing is simple, but long-term myopia progression occurs due to inappropriate peripheral correction
Solution Approach 1:
The lens implements spatially varying optical power with the central zone providing full myopia correction and the peripheral zone providing reduced correction. This local differentiation addresses long-term myopia progression while maintaining manufacturability through established progressive lens fabrication techniques.
Solution Approach 2:
The lens varies the optical power parameter across different zones: full correction power in the central zone and reduced correction power in the peripheral zone. This parameter variation improves long-term myopia control effectiveness while using standard progressive lens manufacturing processes.
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 lens effectively reduces the risk of long-term myopia aggravation by providing tailored corrections for foveal and peripheral visions, ensuring images are properly formed on the retina across various observation distances and angles, enhancing visual comfort and reducing myopia progression.
Implementation Method 1
a far vision area, in which the lens has a first optical power value adapted to produce the myopia correction for the foveal vision of the wearer
Data Source
AI summary
A progressive ophthalmic lens for the correction of myopia, that comprises an upper area in which the correction is adapted for peripheral vision of the wearer. Such a lens reduces the risk of long term worsening of myopia for the lens wearer by reducing the defocalisation of an image formed on the retina outside the foveolar area. Also disclosed is a method for making such a lens. According to one improvement, the correction of myopia for the peripheral vision in the upper area of the lens is further adjusted based on a tendency of the wearer to turn the eyes or the head for watching an eccentric object.