Prismatic Lens with Variable Prism Power for Binocular Vision

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional prismatic lenses have limitations in prescribing prism power, which restricts their effectiveness in addressing binocular vision issues at intermediate and near distances, leading to visual disturbances like double vision and headaches, as they can only accommodate the maximum prism needed at distance viewing.

Innovation Solution

A novel prismatic lens design with a progressive increase in prism power from the distance portion to the reading portion, allowing for a wider range of prism prescriptions without manufacturing restrictions, including a distance portion with fixed prism diopter power and a reading portion with adjustable prism power, enabling greater flexibility in addressing binocular disparities at various viewing distances.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional prismatic lenses are used with uniform prism power at all distances, then the maximum prism needed at distance viewing can be accommodated, but visual disturbances occur at near distances due to excessive prism power

Engineering Contradiction:

Improveeffectiveness in treating binocular vision issuesVSAvoidvisual disturbances

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The lens applies different prism powers to different regions: the distance portion has a first prism power while the near portion has a second, higher prism power. This local differentiation allows each region to provide the appropriate corrective force for its specific viewing distance, eliminating visual disturbances while maintaining treatment effectiveness.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The lens is divided into distinct segments - a distance portion and a near portion - each with independently optimized prism characteristics. This segmentation enables the lens to address binocular vision issues at multiple distances simultaneously without the trade-offs inherent in uniform prism designs.

Inventive Principle:

Principle #1Segmentation

2Ease of manufacture

If uniform prism power is ground into the lens surface during fabrication, then manufacturing simplicity is maintained, but the prism power cannot be optimized for different viewing distances

Engineering Contradiction:

Improvefabrication process simplicityVSAvoidprism power range for different distances

Core Design Contradiction:

Ease of manufactureVSAdaptability or versatility

Solution Approach 1:

The manufacturing process creates local variations in prism power across the lens surface. The distance portion and near portion are fabricated with different prism characteristics through controlled variations in surface curvature or thickness during the grinding and polishing operations, enabling distance-specific optimization without complex assembly steps.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS11899290B1Prismatic lens

Publication Date: 2024.02.13 RUBINFELD ERIC

AI summary

According to some embodiments, a progressive addition lens includes a distance portion and a reading portion. The distance portion includes a fixed prism diopter power. The reading portion includes a fixed base in prism. The fixed base in prism comprises a diopter power between 0 to 10 diopters greater than the fixed prism diopter power of the distance portion.