Progressive Addition Lens Night Vision Reference Point
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Solution Overview
Problem
Current eyewear solutions require multiple spectacles for daytime and nighttime vision correction, which is inconvenient and costly, and existing adaptive systems are complex and not intuitive for presbyopic users.
Innovation Solution
A progressive addition lens with specific optical spherical power variations and reference points that allow for intuitive adjustment of vision correction by changing the vertical head angle, incorporating a night vision reference point with lower optical power to correct night myopia without moving the frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a user wears two different spectacles (one for daytime, one for nighttime), then vision correction for both daytime and nighttime is achieved, but the device complexity and cost increase
Solution Approach 1:
The patent combines daytime and nighttime vision correction into a single progressive addition lens. The lens integrates multiple optical zones: a first zone for daytime far vision, a second zone for daytime near vision, and a third zone for nighttime far vision with reduced spherical power. This merging eliminates the need for multiple spectacles while maintaining reliable vision correction across different conditions.
Solution Approach 2:
The progressive addition lens serves multiple functions within a single device. It provides daytime far vision correction, daytime near vision correction through progressive addition, and nighttime far vision correction with reduced spherical power to account for night myopia. This multi-functionality allows one lens to replace what previously required two separate spectacles.
2Adaptability or versatility
If a complex mechanism with controller is used to move the lens relatively to the wearer's eye, then adaptive vision correction is achieved, but the device complexity increases
Solution Approach 1:
The patent creates a dynamic visual experience without mechanical movement. By designing the lens with varying spherical power across different zones and utilizing the natural dynamics of head movement and gaze direction, the system adapts to different viewing conditions. The wearer's natural head movements activate different optical zones, providing adaptive correction without any mechanical components.
Solution Approach 2:
The patent replaces the mechanical lens-moving system with an optical design that achieves the same adaptive function. Instead of mechanically moving the lens relative to the eye, the invention uses optical power variations across fixed lens zones that respond to the wearer's natural head and eye movements, substituting mechanics with optics.
3Reliability
If a progressive addition lens with reduced spherical power in upper area is used, then nighttime vision correction is improved, but the optical design complexity increases
Solution Approach 1:
The patent applies local quality by giving different spherical power characteristics to different zones of the lens. The upper area (third zone) has reduced spherical power specifically optimized for nighttime far vision, while other zones maintain their original power characteristics for daytime use. This localized modification improves nighttime correction without requiring complete redesign of the entire optical system.
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
Enables seamless transition between daytime and nighttime vision correction using the same lens by adjusting head position, reducing the need for multiple spectacles and providing intuitive use for both presbyopic and non-presbyopic users.
Implementation Method 1
the progressive addition lens comprising a first optical spherical power variation between the first fitting point and the near vision reference point
Data Source
AI summary
A progressive addition lens includes a first fitting point, a near vision reference point and a first optical spherical power variation between the first fitting point and the near vision reference point. The lens further includes a second fitting point and a night vision reference point located on a same face of the lens, the night vision reference point being positioned on an eye gaze direction inclined by an upward eye gaze declination angle when the user wears the progressive addition lens mounted in a frame with a downward head declination angle opposite to the upward eye gaze declination angle without moving the frame relatively to the user's face, the progressive addition lens presenting a second optical spherical power variation between the second fitting point and the night vision reference point, the night vision reference point having a lower optical spherical power than the second fitting point.