Progressive-Power Lens Design for Intermediate Vision Blurring

Solution Overview

Problem

Progressive-power lenses currently fail to provide distinct vision in intermediate side regions, leading to blurring due to astigmatism or dioptric power errors, especially in specific work environments like car driving and personal computer operation, where the wearer must move their line of sight between different priority targets.

Innovation Solution

A method for producing progressive-power lenses that sets priorities among target objects and assigns quasi-distinct vision points, optimizing dioptric power and aberrations based on the distance and change in distance to these points, allowing for comfortable viewing of multiple targets without turning the head.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the lens is designed with traditional progressive-power regions, then the far and near regions provide distinct vision, but the intermediate side regions cause blurring due to astigmatism or dioptric power errors

Engineering Contradiction:

Improvedistinct vision qualityVSAvoidblurring in intermediate side regions

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The lens is divided into multiple functional regions: far vision region, near vision region, progressive region, and additional intermediate vision regions. Each region is optimized for specific viewing distances and directions, with the intermediate vision regions specifically designed to reduce blurring when viewing objects at intermediate distances to the right or left of the central axis.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the lens are assigned different optical characteristics tailored to their specific viewing functions. The intermediate side regions have optimized astigmatism and dioptric power specifically for viewing objects at intermediate distances in lateral directions, while the central regions maintain traditional progressive-power characteristics for far and near vision.

Inventive Principle:

Principle #3Local quality

2Area of stationary object

If the lens is optimized for car driving by adjusting near and far region sizes and aspheric coefficients, then the distinct vision area is partially enlarged, but blurring still occurs in intermediate side regions when viewing side-view mirrors

Engineering Contradiction:

Improvedistinct vision areaVSAvoidblurring in intermediate side regions

Core Design Contradiction:

Area of stationary objectVSObject-affected harmful factors

Solution Approach 1:

The lens is divided into multiple functional regions: far vision region, near vision region, progressive region, and additional intermediate vision regions. Each region is optimized for specific viewing distances and directions, with the intermediate vision regions specifically designed to reduce blurring when viewing objects at intermediate distances to the right or left of the central axis.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the lens are assigned different optical characteristics tailored to their specific viewing functions. The intermediate side regions have optimized astigmatism and dioptric power specifically for viewing objects at intermediate distances in lateral directions, while the central regions maintain traditional progressive-power characteristics for far and near vision.

Inventive Principle:

Principle #3Local quality

3Adaptability or versatility

If the wearer moves the line of sight into intermediate side regions to view side-view mirrors, then the distinct vision area is accessed, but blurring occurs due to astigmatism or dioptric power errors

Engineering Contradiction:

Improveviewing capability for multiple targetsVSAvoidblurring

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The lens is divided into multiple functional regions: far vision region, near vision region, progressive region, and additional intermediate vision regions. Each region is optimized for specific viewing distances and directions, with the intermediate vision regions specifically designed to reduce blurring when viewing objects at intermediate distances to the right or left of the central axis.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the lens are assigned different optical characteristics tailored to their specific viewing functions. The intermediate side regions have optimized astigmatism and dioptric power specifically for viewing objects at intermediate distances in lateral directions, while the central regions maintain traditional progressive-power characteristics for far and near vision.

Inventive Principle:

Principle #3Local quality

Data Source

PatentEP2369403B1Progressive-power lens producing method and progressive-power lens producing system

Publication Date: 2016.08.03 EHS LENS PHILIPPINES

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AI summary

A progressive-lens designing system according to an embodiment of the invention includes a manufacturer-side terminal (100) installed at a lens manufacturer and a shop-side terminal (200) installed in a spectacle shop or any other location, the manufacturer-side terminal (100) and the shop-side terminal (200) are connected to each other via a network (300). The manufacturer-side terminal (100) includes an optimization coefficient setting section (122) that uses a variety of data received from the shop-side terminal (200) to set an optimization coefficient for each target object in a specific work environment, a dioptric power computing section (123) that computes a target dioptric power for each target object, a lens designing section (124) that performs lens design, and an order processing section (125) that performs order processing when receiving an order placed from the shop-side terminal (200).