High Plus Treatment Zone Contact Lens Design
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Solution Overview
Problem
Current myopia control treatments using corrective lenses do not effectively address the progression of myopia, with existing high plus or high add power designs often resulting in significant visual acuity loss and contrast sensitivity issues, limiting their efficacy to less than 50% slowdown in myopia progression.
Innovation Solution
The design of an ophthalmic contact lens with a high plus or high add treatment zone, featuring a power profile that increases from the center zone to greater than +5.00D between 3 mm and 4.5 mm from the lens center, minimizing the halo effect and maintaining effective distance vision correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high plus or high add power treatment zones are used to slow myopia progression, then myopia progression is reduced, but visual acuity loss and contrast sensitivity issues increase
Solution Approach 1:
The lens implements different optical powers in different zones: the central optic zone provides distance vision correction with negative power, while the peripheral treatment zone provides myopia control with high plus power greater than +5.00D. This local differentiation allows each zone to perform its specific function without interfering with the other, resolving the contradiction between myopia control effectiveness and visual acuity maintenance.
2Reliability
If high plus power treatment zone greater than +5.00D is implemented, then myopia progression slowdown exceeds 50%, but halo effect increases
Solution Approach 1:
The lens is divided into distinct functional zones with clear boundaries: the central optic zone for distance correction and the peripheral treatment zone for myopia control. By segmenting the lens this way, the high plus power is confined to the peripheral region where it cannot create halo effects that would interfere with central vision, while still providing effective myopia progression control.
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
This design achieves a greater than 50% slowdown in myopia progression while minimizing visual acuity loss and halo effects, providing a more effective and cost-effective means for myopia control compared to conventional lenses.
Implementation Method 1
the terms myopia and hyperopia are used to include simple myopia or myopic astigmatism andhyperopia and hyperopic astigmatism respectively. It is observed, however, that most normal eyes exhibit positive longitudinal spherical aberration
Implementation Method 2
defocusing the retinal image in both chick and primate animal models, through positive lenses (myopic defocus) or negative lenses (hyperopic defocus), is known to lead to predictable (in terms of both direction and magnitude) changes in eye growth
Data Source
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AI summary
Contact lenses incorporate high plus or add power profiles that at least one of slow, retard or preventing myopia progression and minimize halo effect. The lens includes a center zone with a negative power for myopic vision correction; and at least one treatment zone surrounding the center zone, the at least one treatment zone having a power profile that increases from an outer margin of the center zone to a positive power within the at least one treatment zone of greater than +5.00D.