Three-Zone Myopia Control Contact Lens for Peripheral Defocus
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Solution Overview
Problem
Current myopia control contact lenses suffer from issues such as under-correction in the central area, increased accommodation lag, and asymmetrical peripheral defocus, leading to poor vision quality and ineffective myopia progression management.
Innovation Solution
A myopia control contact lens design featuring a central correction area, an accommodative regulation area with spherical aberration changes, and a defocus area with a defocus variable diopter distribution, addressing these issues by providing complete central correction, reducing accommodation lag and microfluctuations, and ensuring symmetrical peripheral myopic defocus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If myopia control contact lenses use conventional optical design, then peripheral defocus effect is increased, but central vision quality deteriorates due to under-correction
Solution Approach 1:
The contact lens is divided into three distinct zones: a central correction area for precise vision correction, an intermediate accommodative regulation area with spherical aberration changes, and a peripheral defocus area for myopia control. This segmentation allows each zone to independently optimize its function without compromising others, resolving the contradiction between central correction accuracy and peripheral defocus effect.
Solution Approach 2:
Different optical properties are assigned to different regions of the lens: the central area provides precise diopter correction, the intermediate area introduces controlled spherical aberration changes, and the peripheral area creates myopic defocus. This local differentiation enables simultaneous optimization of central vision quality and peripheral myopia control effectiveness.
2Reliability
If myopia control contact lenses increase peripheral defocus effect, then accommodation lag increases, but vision quality deteriorates
Solution Approach 1:
The lens separates the accommodative regulation function into a distinct intermediate zone between the central correction area and peripheral defocus area. This zone contains controlled spherical aberration changes that specifically target accommodation lag without affecting central vision or peripheral defocus effectiveness.
Solution Approach 2:
The intermediate accommodative regulation area acts as a mediator between the central correction area and peripheral defocus area. The spherical aberration changes in this intermediate zone modulate accommodation response, reducing accommodation lag while maintaining the myopic defocus effect in the periphery and clear vision in the center.
3Reliability
If myopia control contact lenses use conventional defocus distribution, then peripheral defocus is achieved, but asymmetrical hyperopic defocus occurs on the nasal side
Solution Approach 1:
The peripheral defocus area is designed with asymmetric spherical aberration changes that specifically address the nasal side hyperopic defocus issue. By locally adjusting the optical properties in the nasal peripheral region, the lens achieves symmetrical myopic defocus across both temporal and nasal sides of the retina.
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 enhances vision quality, reduces accommodation lag and microfluctuations, and effectively controls myopia progression by stabilizing focus on the retina and addressing peripheral defocus asymmetry.
Implementation Method 1
the accommodative regulation area has a first diopter distribution with N spherical aberration changes in a radial direction
Implementation Method 2
the defocus area has a second diopter distribution in the radial direction. A maximum diopter of the second diopter distribution is obtained by adding a defocus variable to the predetermined diopter
Data Source
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AI summary
A myopia control contact lens (10) includes a central correction area (A1), an accommodative regulation area (A2) and a defocus area (A3). The central correction area (A1) provides a predetermined diopter. The accommodative regulation area (A2) surrounds the central correction area (A1), the accommodative regulation area (A2) has a first diopter distribution with N spherical aberration changes in a radial direction (Dr), and N is a positive integer. The defocus area (A3) surrounds the accommodative regulation area (A2), and the defocus area (A3) has a second diopter distribution in the radial direction (Dr). A maximum diopter of the second diopter distribution is obtained by adding a defocus variable to the predetermined diopter, and the defocus variable satisfies the following equation: Y=a*X2+b*X+c, where X is the predetermined diopter, Y is a defocus variable, a is a first coefficient, b is a second coefficient, c is a constant, a and b range from 0 to 5, and c ranges from 0.5 to 15.