Myopia Control Contact Lens with Concentric Zones
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Solution Overview
Problem
Conventional contact lenses are uncomfortable for wearers due to the distant formation of central and peripheral zone focuses, which are not effective in simultaneously correcting myopia and suppressing its progression.
Innovation Solution
A contact lens design featuring concentric central, transition, and peripheral zones with specific radii and refractive powers, where the transition zone provides refractive power to adjust focus positions, forming images on or in front of the retina, thereby relieving discomfort and effectively correcting myopia.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the peripheral zone focus is formed in front of the retina to achieve myopia control, then the progression of myopia is suppressed, but the wearer feels uncomfortable
Solution Approach 1:
The contact lens is divided into three distinct concentric zones: central zone (0.5-2.6mm radius) for clear distance vision, transition zone (1-3.9mm radius) with aspheric surfaces providing intermediate focus, and peripheral zone (3-7.7mm radius) for myopic defocus. This segmentation allows each zone to independently perform its specific function without compromising others, resolving the contradiction between myopia control and comfort.
Solution Approach 2:
The transition zone acts as an intermediary between the central and peripheral zones, providing intermediate focal points that bridge the gap between the clear central vision and the myopic defocus in the periphery. This mediator zone reduces the abrupt visual transition that causes discomfort while maintaining the myopia control effect of the peripheral zone.
2Measurement precision
If the contact lens provides clear central vision, then myopia is corrected, but the peripheral zone cannot provide myopic defocus effect
Solution Approach 1:
Different zones of the contact lens are assigned different optical properties: the central zone has standard spherical power for clear foveal vision, the transition zone has aspheric surfaces creating intermediate focuses, and the peripheral zone has specific power distribution for para-foveal myopic defocus. This local differentiation allows simultaneous achievement of clear central vision and effective peripheral myopia control.
Solution Approach 2:
The contact lens design extends the traditional single-focus optical system into a multi-dimensional focal structure with three distinct focal planes corresponding to the three zones. This dimensional expansion in the optical path allows the lens to simultaneously provide clear central vision, intermediate transition images, and peripheral myopic defocus, resolving the contradiction between central vision correction and peripheral myopia control.
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 contact lens design allows for clear central vision, myopic defocus effect in the periphery, and a buffer zone to reduce eye growth, making it comfortable for wearers while simultaneously correcting myopia and suppressing its progression.
Implementation Method 1
the transition zone with one or more focuses provides refractive power in diopter (D) ranging from +0.25 D to +8.00 D
Implementation Method 2
the growth of the eyeball can be effectively suppressed to slow the progression of myopia if the peripheral-zone focus 02 image is formed in the front of the retina by a myopic defocus effect
Data Source
AI summary
This invention provides a contact lens for myopia control comprising: an object-side surface comprising a central zone, a transition zone and a peripheral zone which are concentric and have different refractive power, at least one of the three zones being aspheric; and an image-side surface; wherein the central zone provides correction power to focus a foveal image on the retina, the peripheral zone provides a myopic defocus effect by generating a para-fovea image in front of the retina, and the transition zone with one or more focuses provides a refractive power in diopter (D) ranging from +0.25 D to +8.00 D.