Non-Corrective Plastic Spectacle Lens with Spherical Power for Eye Strain Relief
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Solution Overview
Problem
Conventional non-corrective plastic spectacle lenses fail to alleviate eye strain and improve eyesight in low-illuminance environments, as they do not effectively assist the eye's focus adjustment function and can reduce light transmission, leading to difficulty in seeing small objects or recognizing colors and shapes.
Innovation Solution
A non-corrective plastic spectacle lens with a spherical power within the range of −1.0 D≤S<−0.1 D, which assists the eye's focus adjustment function by reducing the movement necessary for focus adjustment, and may include a polarizing element to enhance contrast in low-illuminance environments, manufactured using a method involving molds with different radii of curvature for efficient molding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If non-corrective plastic spectacle lenses with 0 D spherical power are used, then the lenses maintain transparency and do not correct eyesight, but they fail to assist the eye's focus adjustment function and cannot alleviate eye strain
Solution Approach 1:
The patent applies parameter changes by setting the spherical power of non-corrective lenses within a specific range (−1.0 D to +1.0 D) rather than strictly at 0 D. This parameter modification enables the lenses to assist the eye's focus adjustment function while maintaining their non-corrective nature, thereby alleviating eye strain without requiring precise polishing procedures.
Solution Approach 2:
The patent implements partial action by providing a small degree of spherical power (within −1.0 D to +1.0 D) that is sufficient to assist focus adjustment but not strong enough to correct eyesight. This partial power level achieves the desired effect of reducing ciliary muscle fatigue without over-correcting vision, aligning with the principle of using just enough action to solve the problem.
2Object-affected harmful factors
If polarizing elements or dyes are added to lenses, then glare and reflected light are reduced, but the amount of light transmitted through the lenses decreases, causing difficulty in seeing small objects and letters in low illuminance
Solution Approach 1:
The patent applies parameter changes by optimizing the spherical power within the range of −1.0 D to +1.0 D, which enhances the eye's focus adjustment function and allows better utilization of available light. This parameter optimization compensates for the light transmission reduction caused by polarizing elements, enabling improved vision in low-illuminance environments while maintaining glare reduction benefits.
3Ease of manufacture
If conventional non-corrective lenses are used, then the lenses are simple and inexpensive to manufacture, but they cannot improve eyesight deterioration or reduce eye fatigue from continuous muscle overuse
Solution Approach 1:
The patent applies parameter changes by defining a specific spherical power range (−1.0 D to +1.0 D) that can be achieved through molding without requiring complex polishing procedures. This approach maintains manufacturing simplicity while reliably providing focus adjustment assistance that alleviates eye strain from continuous muscle overuse.
Solution Approach 2:
The patent implements self-service by designing lenses that automatically assist the eye's focus adjustment function through their inherent spherical power within the specified range. The lenses work passively to reduce ciliary muscle fatigue without requiring active control or complex manufacturing interventions, making them both easy to manufacture and effective at preventing eye strain.
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 lens reduces eye fatigue and enables clear vision of objects and letters with high contrast in low-illuminance environments, while being efficiently manufactured with stable quality, and can be used to alleviate eye strain without the need for precise polishing.
Implementation Method 1
a non-corrective spectacle lens comprising a molded plastic lens having a spherical power S within a range of −1.0 D≤S<+1.0 D
Implementation Method 2
Polarizing glasses are capable of alleviating glare caused by the diffuse reflection of sunlight from e.g., a water surface or a snow surface, and alleviating reflected light causing a shadow to appear on the windshield
Data Source
AI summary
The present invention provides a non-corrective spectacle lens which is a molded plastic lens used by a person having normal eyesight, or a polarizing lens constituted by the molded plastic lens and a polarizing film integrally superposed on the molded plastic lens. In order to moderately reduce the movement of the muscle necessary for focus adjustment, the non-corrective spectacle lens has a spherical power S within the range of −1.0 D≤S<−0.1 D, where D is diopter as a unit of the spherical power S.