Ophthalmic Lens Refractive Power Accuracy Near Functional Area
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Solution Overview
Problem
Existing ophthalmic lenses with refractive and functional areas face challenges in achieving consistent refractive power across the entire lens, especially near the functional area, due to the arrangement and shape of these areas, which can lead to refractive power errors and reduced visual performance.
Innovation Solution
The lens design incorporates a refractive area and a functional area, where a specific zone on the lens has more than 5% of its surface with a local refractive power within 0.25 diopters of the prescribed refractive power, and more than 25% of the surface covers the functional area, ensuring preserved visual performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lens includes a functional area with optical elements on the surface, then the abnormal refraction progression is slowed down, but the refractive power accuracy is reduced due to coating defects
Solution Approach 1:
The patent introduces an intermediary layer (coating) between the optical elements and the external environment, which mediates the interaction by protecting the optical elements while maintaining their optical function. The coating acts as a buffer that prevents direct contact between the optical elements and environmental factors, thereby preserving refractive power accuracy.
Solution Approach 2:
The patent modifies the parameters of the coating process and the optical element design to ensure that the coating does not significantly alter the curvature or refractive properties of the underlying optical elements. By controlling coating thickness and application parameters, the refractive power accuracy is maintained despite the presence of the coating layer.
2Reliability
If the coating is applied over the optical elements, then the functional area is protected, but the curvature of the refractive area is negatively affected
Solution Approach 1:
The patent applies different qualities or properties to different parts of the lens. The coating is applied selectively to the functional area with optical elements, while the refractive area maintains its original curvature characteristics. This local differentiation allows the functional area to be protected without compromising the shape and optical performance of the refractive area.
Solution Approach 2:
The lens is segmented into distinct functional areas: the refractive area and the functional area with optical elements. The coating is applied specifically to the functional area, creating a segmented structure where each area has its own protective measures. This segmentation allows the refractive area curvature to remain unaffected while the functional area receives protective coating.
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 effectively maintains the prescribed refractive power and visual performance by ensuring that the refractive power error is minimized across the lens, particularly in the vicinity of the functional area.
Implementation Method 1
a refractive area configured to provide a first refractive power (Rx) for correcting an abnormal refraction of the eye
Data Source
AI summary
It is proposed a lens intended to be worn in front of or on an eye of a wearer and to provide a first refractive power (Rx) for correcting an abnormal refraction of the eye of the wearer; wherein the lens comprises a refractive area configured to provide the first refractive power (Rx) and a functional area configured to provide an optical function; and wherein on a first zone defined on the lens, more than 5% of the surface of said first zone has a local refractive power ranging from the first refractive power (Rx) minus 0.25 diopter and the first refractive power (Rx) plus 0.25 diopter, and more than 25% of the surface of said first zone covers the functional area.