Ophthalmic Lens Diffraction Structure for Myopia Control Aberration

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Solution Overview

Problem

Existing methods for suppressing near-sightedness progression, such as those described in Patent Documents 1 and 2, do not adequately address longitudinal chromatic aberration caused by eyeglass lenses, which can hinder the near-sightedness progression suppressing effect unless appropriate longitudinal chromatic aberration is generated.

Innovation Solution

Incorporating a diffraction structure on the eyeglass lens with a blaze wavelength set to the short wavelength side, providing positive longitudinal chromatic aberration, and optionally using a wavelength filter to attenuate longer wavelengths, thereby adjusting the focus positions of different wavelength light rays to enhance the near-sightedness progression suppressing effect.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If wavelength filtering is used to suppress near-sightedness progression, then the near-sightedness progression suppressing effect is improved, but longitudinal chromatic aberration caused by the eyeglass lens itself is not addressed, reducing overall effectiveness

Engineering Contradiction:

Improvenear-sightedness progression suppressing effectVSAvoidlongitudinal chromatic aberration

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies parameter changes by modifying the refractive index distribution within the lens material. Specifically, it uses a gradient refractive index design where the refractive index varies continuously from the center to the edge of the lens, thereby correcting longitudinal chromatic aberration while maintaining the wavelength filtering effect for near-sightedness suppression.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite materials by combining wavelength filtering layers with gradient refractive index lens material. This composite structure allows simultaneous achievement of wavelength-specific near-sightedness suppression and chromatic aberration correction, resolving the technical contradiction between these two functions.

Inventive Principle:

Principle #40Composite materials

2Use of energy by moving object

If a diffraction structure with blaze wavelength on the short wavelength side is provided, then blue light diffraction efficiency is improved, but the lens complexity increases

Engineering Contradiction:

Improveblue light diffraction efficiencyVSAvoidlens structure

Core Design Contradiction:

Use of energy by moving objectVSDevice complexity

Solution Approach 1:

The patent merges the diffraction structure with the wavelength filtering layer and gradient refractive index design into a single integrated lens system. This combination achieves high blue light diffraction efficiency while avoiding the need for separate complex components, thereby resolving the contradiction between performance and structural complexity.

Inventive Principle:

Principle #5Merging (Combining)

3Reliability

If positive longitudinal chromatic aberration is introduced to focus blue light on the overfocus side, then the near-sightedness progression suppressing effect is improved, but red light focusing accuracy deteriorates

Engineering Contradiction:

Improvenear-sightedness progression suppressing effectVSAvoidred light focus position

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The patent applies local quality by creating different refractive index characteristics for different wavelength ranges. The gradient refractive index structure provides positive longitudinal chromatic aberration for blue light to suppress near-sightedness progression, while the wavelength filtering layer selectively attenuates red light to minimize its impact on focus accuracy, thereby resolving the local optical quality contradiction.

Inventive Principle:

Principle #3Local quality

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 eyeglass lens with positive longitudinal chromatic aberration and wavelength filtering effectively focuses blue light on the overfocus side and red light on the underfocus side, enhancing the near-sightedness progression suppressing effect while maintaining high diffraction efficiency for blue light and reducing red light's influence.

Implementation Method 1

a diffraction structure for which a blaze wavelength is set to a short wavelength side of visible light is provided on at least one of an object-side surface side and an eyeball-side surface side, and the ophthalmic lens includes positive longitudinal chromatic aberration

Methodology Applied

Scientific EffectDiffraction: Diffraction

Implementation Method 2

an optical filter is provided on the eyeglass lens to form peaks of light intensity in a wavelength range of 460 to 490 nm and a wavelength range of about 490 to 550 nm, and to set the light intensity in the wavelength range of about 550 to 700 nm to 1% or less

Methodology Applied

Scientific EffectWavelength filtering: Filter (optical)

Data Source

PatentEP4036633B1Ophthalmic lens

Publication Date: 2026.03.25 HOYA LENS THAILAND LTD

Figure 1(a)~1(c)
Figure 2

AI summary

Provided are ophthalmic lens and a technique related thereto, the ophthalmic lens having a prescription frequency of zero or less, a diffraction structure for which a blaze wavelength is set on the short wavelength side of visible light being provided on at least one of an object-side surface side and an eyeball-side surface side, and the ophthalmic lens having positive longitudinal chromatic aberration.