Presbyopia-Correcting Intraocular Lens With Ciliary Body Sensor
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Solution Overview
Problem
Current intraocular lenses for presbyopia correction either provide limited accommodation range, result in visual artifacts, or do not seamlessly integrate with the natural neural and mechanical feedback mechanisms of the eye, failing to offer a continuous dynamic range of focus from distance to near distances.
Innovation Solution
A presbyopia-correcting intraocular lens with a dynamic lens assembly that includes a microprocessor, ciliary body sensors, and electromotive rings, which translate the anterior and posterior lenses to achieve a wide range of continuous accommodation by sensing the ciliary body movement and adjusting the refractive power in real-time, coupled with a renewable power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If early accommodating intraocular lens implants (e.g., Crystalens) are used, then the lens provides a high-quality monofocal image with minimal artifacts, but the accommodation range is limited (only 1.5-2.0 diopters)
Solution Approach 1:
The lens is divided into multiple independent segments or zones with different optical powers. Each segment can be independently controlled to provide different focal points, enabling a wider accommodation range while maintaining image quality through selective activation of appropriate segments for different viewing distances
Solution Approach 2:
The lens incorporates dynamic elements such as liquid crystal layers or movable optical components that can change their optical properties in real-time. This dynamic adjustment allows the lens to transition between different focal states, providing continuous accommodation from distance to near vision while maintaining high image quality throughout the range
2Adaptability or versatility
If multifocal lens implants (e.g., ReStor, Array, ReZoom, Tecnis MF) are used, then near vision is adequately provided, but optical distortions occur leading to visual artifacts
Solution Approach 1:
The lens provides more than just near vision capability by incorporating continuous accommodation across the entire visual range. The system uses partial activation of different optical zones based on viewing distance, providing exactly the right amount of refractive power needed for each task without the excessive or conflicting optical forces that cause artifacts in traditional multifocal lenses
Solution Approach 2:
The lens dynamically changes its optical parameters (refractive power, focal length) based on ciliary body position and viewing distance. This continuous parameter adjustment eliminates the fixed, discrete focal points of traditional multifocal lenses that create visual artifacts, instead providing smooth transitions between focal states that maintain image quality
3Adaptability or versatility
If traditional multifocal or monovision approaches are used, then presbyopia correction is achieved, but the solution does not integrate with natural neural and mechanical feedback mechanisms of the eye
Solution Approach 1:
The lens incorporates sensors that detect ciliary body position and provide real-time feedback to control the optical adjustment mechanism. This feedback loop mimics the natural accommodation reflex, where the eye's natural muscular movements are detected and used to automatically adjust the lens power, seamlessly integrating with the eye's existing neural and mechanical feedback systems
Solution Approach 2:
The lens system uses the eye's own natural ciliary body movements as the driving force for accommodation. Rather than requiring external control or complex mechanical actuators, the system harnesses the eye's inherent muscular activity to power the optical adjustment, making the device self-regulating and fully integrated with natural eye physiology
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 a high-quality image with minimal visual distortions and a wide dynamic range of accommodation, effectively addressing the limitations of existing lenses by mimicking the natural accommodation mechanism of the eye.
Implementation Method 1
at least one ciliary body sensor senses movement of the eye's ciliary body
Implementation Method 2
an anterior electromotive ring on the anterior lens and a posterior electromotive ring on the posterior lens translate the posterior lens with respect to the anterior lens
Implementation Method 3
The electromotive rings translate the anterior and posterior lenses to achieve a wide range of continuous accommodation
Data Source
AI summary
A presbyopia correcting intraocular lens implant for implanting in a human eye includes an implant body having a central lens enclosure and at least one stability tab extending therefrom. At least one ciliary body sensor senses movement of the eye's ciliary body. An electronic module is embedded in the implant body and includes a microprocessor communicative with the ciliary body sensor. A dynamic lens assembly is housed in the central lens enclosure and has a dynamic range of continuous accommodation. The lens implant also includes a renewable intraocular power supply.