Progressive Ophthalmic Lenses Binocular Vision Coordination
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Solution Overview
Problem
Existing progressive ophthalmic lenses often cause vision discomfort due to mismatched peripheral gaze directions when paired, as they are optimized separately for far and proximate vision without considering binocular vision coordination.
Innovation Solution
A pair of progressive ophthalmic lenses with a common prescribed far vision mean refractive power and addition, featuring specific height differences and refractive power gradients to ensure minimal astigmatism and comfortable peripheral vision, with each lens optimized to provide enhanced far or proximate vision zones for binocular vision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If each progressive lens is optimized separately for far and proximate vision, then the vision zones for each eye are improved, but peripheral gaze directions cause vision discomfort due to mismatched lens designs
Solution Approach 1:
The patent applies asymmetry by allowing different lens designs for the right and left eyes, where each lens is optimized according to the specific visual needs of its corresponding eye. This enables asymmetric optimization of far and proximate vision zones while maintaining coordination through the cyclopean coordinate system, resolving the contradiction between individual eye optimization and binocular comfort.
Solution Approach 2:
The patent utilizes parameter changes by defining specific constraints on the first and second heights (angular parameters) of the lenses. By controlling the difference in these parameters between the two lenses, the invention optimizes the refractive power distribution across the lens zones while ensuring compatibility for binocular vision, thereby reducing peripheral discomfort.
2Adaptability or versatility
If one lens has a large far vision zone and the other has a large proximate vision zone, then binocular vision is enhanced, but the smallest vision zones cause discomfort in peripheral gaze directions
Solution Approach 1:
The patent applies local quality by optimizing different regions of each lens with specific refractive power characteristics tailored to local visual needs. Each lens has locally optimized far and proximate vision zones, and the coordination between lenses through the cyclopean coordinate system ensures that peripheral regions also maintain quality, resolving the contradiction between versatility and comfort.
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 solution provides improved binocular vision with reduced discomfort by ensuring that both lenses have vertically increased vision zones and similar refractive power gradients, enhancing the wearer's perceived field of vision while maintaining comfort in peripheral vision.
Implementation Method 1
each progressive ophthalmic lens has a mean refractive power which varies along a meridian line of the lens
Data Source
AI summary
A pair of progressive ophthalmic lenses (1, 2) meets special conditions for improving binocular vision of a wearer, while avoiding discomfort for peripheral vision. A first one of the conditions relates to height values of far vision fields, intermediate vision fields and/or proximate vision fields, for indicating that the fields are different enough in height between both lenses. A second one of the conditions sets a maximum value for the relative difference in mean refractive power gradient between both lenses.