Unifocal Ophthalmic Lens Power Variation Calculation
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Solution Overview
Problem
Conventional single-vision ophthalmic lenses do not adequately address visual fatigue and comfort issues for ametropic and presbyopic wearers, particularly in terms of sharpness and accommodative dynamics of the eye.
Innovation Solution
A method for calculating a personalized ophthalmic lens that includes optimizing the power and astigmatism variations along specific gaze paths, using a computer-based optical system design that accounts for the wearer's prescription, accommodative dynamics, and eye positioning, resulting in improved clarity and comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional single-vision lenses with spherical or toric surfaces are used, then the lens structure is simple and easy to manufacture, but the visual comfort and sharpness are insufficient for ametropic and presbyopic wearers
Solution Approach 1:
The patent applies local quality by creating different optical zones within the lens with distinct power characteristics. The lens contains a first zone with power equal to the wearer's prescription and a second zone with different power, allowing different regions of the lens to serve different visual functions. This resolves the contradiction by providing enhanced visual comfort through localized optical properties without requiring complete redesign of the entire lens structure.
Solution Approach 2:
The patent segments the lens into multiple functional zones with different optical powers. By dividing the lens into a first zone (with prescription power) and a second zone (with different power), the invention enables simultaneous provision of distance and near vision correction, improving visual comfort while maintaining a relatively simple single-lens structure rather than requiring multiple separate lenses.
2Manufacturing precision
If aspherical lenses are used to optimize visual aberrations, then the optical quality is improved, but the lens design and manufacturing become more complex
Solution Approach 1:
The patent applies local quality by creating different optical zones within the lens with distinct power characteristics. The lens contains a first zone with power equal to the wearer's prescription and a second zone with different power, allowing different regions of the lens to serve different visual functions. This resolves the contradiction by providing enhanced visual comfort through localized optical properties without requiring complete redesign of the entire lens structure.
3Measurement precision
If the lens power is exactly equal to the wearer's prescription, then the prescription accuracy is maximized, but the accommodative dynamics of the eye are not adequately addressed
Solution Approach 1:
The patent applies parameter changes by intentionally varying the lens power in different zones rather than maintaining a uniform prescription power throughout. The first zone has power equal to the wearer's prescription while the second zone has different power, allowing the lens to adapt to the eye's accommodative dynamics. This resolves the contradiction by providing both prescription accuracy in the primary viewing zone and adaptability to accommodative changes through power variation in other zones.
Solution Approach 2:
The patent applies dynamics by creating a lens that adapts to the eye's changing accommodative state. By incorporating zones with different powers, the lens can effectively respond to dynamic accommodative demands during near and distance viewing, making the optical system more adaptable to the living, changing visual needs of the wearer rather than being static.
Data Source
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AI summary
The invention relates to an ophthalmic lens (1), including: a front surface and a back surface; a prescription control point (P); an upper area having, relative to the point (P), an average-power continuous variation ?PuiSup that is monotonous between the point (P) and the point (Psup) (maximum variation point in absolute value) where the signed value of the variation ?PuiSupMax=Pui (Psup)-Pui (P) is between -0.1 and -0.4 dioptres; a lower area having, relative to the point (P), an average-power continuous variation ?Puinf that is monotonous between the point (P) and the point (Pinf) (maximum variation point in absolute value) where the signed value of the variation ?PuiinfMax=Pui (PInf ) -Pui (P) is between +0.1 and +0.4 dioptres; the average power gradient being lower than 4.10-2 X ?Puitotal,where ?Puitotal= |?PuisupMax| + ?PuiInfMax. Such a lens advantageously takes the accommodative dynamics of the eye into account and increases the visual comfort of the wearer.