Optical Lens Coating Compensation for Refraction Control
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Solution Overview
Problem
Conventional methods for treating optical lenses with complex designs to prevent or slow down abnormal eye refractions, such as myopia or hyperopia, face challenges due to the thickness of coating layers affecting light transmission and optical function, making it difficult to compensate for modifications induced by treatments.
Innovation Solution
A method implemented by computer means for determining a lens element with a holder and optical elements, where a coating process is used to apply a layer that compensates for modifications in optical function, involving providing lens data and a coating transfer law to adjust the design and ensure accurate targeted optical function.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coating layer is applied to treat the surface of an optical lens, then the lens gains protective properties (anti-scratch, anti-reflective), but the coating layer thickness modifies the optical function and light ray transmission
Solution Approach 1:
The patent applies preliminary action by modifying the optical element design before coating application. The design includes pre-calculated compensations for the expected coating thickness and refractive index effects, so that after coating, the optical element achieves the desired optical function. This is done by adjusting the base optical element parameters anticipatorily.
Solution Approach 2:
The patent employs parameter changes by systematically varying the design parameters of optical elements (curvature, thickness, refractive index) based on the anticipated coating characteristics. The design process iteratively adjusts these parameters to compensate for the coating's optical effects, transforming the design space to account for coating-induced modifications.
2Strength
If the coating layer thickness is increased to enhance protective properties, then durability improves, but the modification of optical function increases
Solution Approach 1:
The patent uses parameter changes by establishing design rules that adjust optical element parameters as a function of coating thickness. As coating thickness increases to improve durability, the optical element parameters (curvature, thickness, refractive index) are systematically modified to compensate, maintaining optical function accuracy despite the increased coating thickness.
3Ease of manufacture
If conventional treating methods are used on lenses with complex designs containing optical elements, then the treatment process remains simple, but the coating thickness heterogeneity modifies the optical function
Solution Approach 1:
The patent applies local quality by designing optical elements with spatially varying parameters across their surfaces. Different regions of the optical element have different curvatures, thicknesses, or refractive indices to compensate for the non-uniform coating thickness that occurs during conventional treatment processes. This localized parameter variation ensures that even with coating heterogeneity, the overall optical function remains accurate.
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 method allows for the creation of lenses that effectively slow down or prevent abnormal eye refractions by compensating for modifications caused by treatments, maintaining accurate optical function and vision performance.
Implementation Method 1
the index of refraction of the coating layer covering optical elements may impact the light ray transmission and thus modify the optical function of said optical elements
Data Source
AI summary
A lens element adapted for a person including a holder including a refraction area having a refractive power based on a prescription for correcting an abnormal refraction of the person, a plurality of optical elements placed on at least one surface of the holder to at least one of: slow down, retard, or prevent a progress of the abnormal refraction of an eye of the person, and at least one layer of at least one coating element covering at least a zone of at least one optical element and at least a zone of the holder on which the optical elements are placed, wherein said at least one layer of at least one coating element adds an optical power of 0.1 diopter in absolute value in specific wearing conditions when measured over said zone of the optical element covered by said at least one layer of at least one coating element.