Tinted Contact Lenses with Peripheral Defocus for Myopia Control

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Solution Overview

Problem

Conventional vision correction methods, including eyewear and contact lenses, fail to enhance visual perception and address light sensitivity issues for individuals with myopia, migraine, concussion, or ocular conditions, and are ineffective in preventing or slowing myopia progression, which is a growing global health concern associated with significant ocular pathologies.

Innovation Solution

Soft contact lenses with task-specific tints that filter out harmful UV radiation and manipulate the visible spectrum to enhance visual comfort and performance by controlling the quantity and quality of light, using HEV, PVS, and LEV light wavelengths, and eliminating peripheral light leakage, thereby improving visual clarity and reducing chromatic aberration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If conventional vision correction methods (eyewear or contact lenses) are used to provide normal visual acuity, then clear distance vision is achieved, but visual perception enhancement and light sensitivity symptom relief are not addressed

Engineering Contradiction:

Improvevisual acuityVSAvoidvisual perception enhancement capability

Core Design Contradiction:

Measurement precisionVSAdaptability or versatility

Solution Approach 1:

The patent applies spectral filtering through specific tint compositions that selectively transmit or block certain wavelengths of light. The tint is designed to filter harmful blue light (400-500nm) while transmitting beneficial green light (500-560nm), thereby enhancing visual perception and reducing light sensitivity symptoms without compromising visual acuity. This color-based spectral manipulation directly addresses the limitation of conventional clear lenses.

Inventive Principle:

Principle #32Color changes

2Illumination intensity

If conventional eyewear with tints is used to control light intensity, then light sensitivity is addressed, but peripheral light leakage occurs and visual perception enhancement is limited

Engineering Contradiction:

Improvelight intensity controlVSAvoidperipheral light leakage

Core Design Contradiction:

Illumination intensityVSObject-affected harmful factors

Solution Approach 1:

The patent divides the lens into distinct functional zones: a central optical zone for clear vision and a peripheral zone for myopia control and light management. The peripheral zone extends beyond the visual axis to capture and filter stray light that would otherwise cause glare and reduce contrast. This segmentation allows simultaneous optimization of central vision quality and peripheral light control.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent transitions from traditional 2D lens surfaces to a 3D optical design that incorporates depth and curvature variations. The lens features aspheric surfaces and variable thickness profiles that manipulate light paths in multiple dimensions, enabling effective peripheral light control without compromising central visual acuity. This dimensional approach eliminates the trade-off between light control and visual quality.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Reliability

If dual focus lenses with peripheral defocus are used for myopia control, then some myopia progression is slowed, but visual acuity for distance vision is compromised

Engineering Contradiction:

Improvemyopia control efficacyVSAvoiddistance visual acuity

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The patent applies different optical properties to different regions of the lens: the central optical zone maintains high-quality optics for clear distance vision, while the peripheral zone incorporates myopia control features through specific power adjustments and spectral filtering. This local differentiation allows simultaneous optimization of both distance visual acuity and myopia control efficacy without the compromise seen in conventional dual focus lenses.

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 contact lenses provide enhanced visual performance, reduce myopia progression, and address light sensitivity issues, offering improved visual comfort and clarity under various lighting conditions, while being easy to handle and wear, especially for those unfamiliar with contact lenses.

Implementation Method 1

A variety of contact lens tints are disclosed that filter out ultraviolet radiation (UVR) and manipulate the visible spectrum (VIS) to the benefit of the wearer

Methodology Applied

Scientific EffectUltraviolet radiation filtering: Absorption (EM radiation)

Implementation Method 2

The contact lens includes a central zone and a peripheral zone, wherein the peripheral zone provides a myopic defocus to a peripheral retina

Methodology Applied

Scientific EffectOptical defocus: Refraction

Data Source

PatentUS20250306401A1Contact lenses combining chromaticity and defocus for myopia control

Publication Date: 2025.10.02 PERFORMANCE VISION TECH INC

AI summary

Lenses are tinted for control of myopia development. These myopia control tints can be provided in contact lenses, eyeglass lenses, goggles, or other viewing optics. In some cases, dual zone lenses include a clear vision portion and a defocus portion in combination with the myopia control tints and/or myopia control medicaments. While users can find that lenses with a defocus zone provoke a feeling of blurred vision, the myopia control tints can address the perceived defocus and provide superior user comfort.