Spectacle Lens Convex Defocus Surfaces for Hyperopia Reduction

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Spectacle lenses with partial concave portions on the surface can cause glare, accumulate dust and oil, and compromise manufacturing quality due to coating issues.

Innovation Solution

A spectacle lens design featuring a convex base surface and non-concave defocus surfaces, where the defocus power is less than -0.25 diopter and combined power is greater than or equal to zero, with the defocus surfaces having a curvature of 0 or more, to achieve hyperopia reduction without concave portions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If partial concave portions are added to the lens surface to achieve hyperopia reduction function, then the hyperopia reduction function is improved, but glare and accumulation of dust, fat and oil occur

Engineering Contradiction:

Improvehyperopia reduction functionVSAvoidglare and accumulation of dust, fat and oil

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

Instead of using concave portions to achieve hyperopia reduction, the patent inverts the approach by using convex portions (bulbous shapes) on the lens surface. The convex portions cause light to converge at a position behind the retina, achieving the same hyperopia reduction function while eliminating the harmful effects of concave surfaces such as glare and dust accumulation.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent changes the surface curvature parameter from negative (concave) to positive (convex). By adjusting the curvature of the lens surface to be convex rather than concave, the optical path is modified to converge light behind the retina, achieving hyperopia reduction without the associated harmful effects.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If partial concave portions are added to the lens surface to achieve hyperopia reduction function, then the hyperopia reduction function is improved, but manufacturing quality is compromised due to coating liquid accumulation

Engineering Contradiction:

Improvehyperopia reduction functionVSAvoidcoating quality

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The patent inverts the surface geometry from concave to convex portions. This inversion eliminates the trapping effect that causes coating liquid accumulation in concave portions, thereby improving manufacturing quality while maintaining the hyperopia reduction function.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent converts the harmful effect of surface geometry that causes coating accumulation into a beneficial design. By using convex portions instead of concave ones, the surface geometry that previously caused manufacturing problems now ensures smooth coating application and eliminates defects.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Reliability

If concave portions are used to achieve hyperopia reduction, then the optical function is improved, but the surface becomes prone to staining from dust, fat and oil

Engineering Contradiction:

Improveoptical functionVSAvoidstaining from dust, fat and oil

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent inverts the surface curvature from concave to convex portions. This inversion changes the surface properties from being stain-prone to stain-resistant, as convex surfaces do not trap dust, fat, and oil in the same way concave surfaces do, thereby eliminating the staining problem while maintaining optical function.

Inventive Principle:

Principle #13The other way round (Inversion)

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 design prevents glare and accumulation of stains while maintaining effective hyperopia reduction, enhancing wearability and manufacturing quality.

Implementation Method 1

a base surface configured to cause a light beam incident from the object side to be emitted toward the eyeball side, and to converge at a position A on a retina of an eyeball; and a plurality of defocus surfaces configured to cause a light beam incident from the object side to be emitted toward the eyeball side, and to converge at a position B that is farther away from the object side than the position A is

Methodology Applied

Scientific EffectRefraction: Refraction

Data Source

PatentUS20250216699A1Spectacle lens and design method of spectacle lens

Publication Date: 2025.07.03 HOYA LENS THAILAND LTD

AI summary

At least one of two optical surfaces respectively located on an object side and an eyeball side has: a base surface configured to cause a light beam incident from the object side to be emitted toward the eyeball side, and to converge at a position A on a retina of an eyeball; and a plurality of defocus surfaces configured to cause a light beam incident from the object side to be emitted toward the eyeball side, and to converge at a position B that is farther away from the object side than the position A is, the base surface is a convex surface, and at least one of the defocus surfaces is a non-concave surface.