Accommodating Intraocular Lens Combining Cubic and Spherical Optics
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Solution Overview
Problem
Existing accommodating intraocular lenses do not effectively combine cubic and spherical optical surfaces to achieve optimal variable focus power through lateral and axial shifts, limiting their ability to restore accommodation and refraction of the eye.
Innovation Solution
An intraocular lens construction with at least two optical elements, each comprising partly cubic and partly spherical surfaces, coupled by an elastic haptic with a hinge mechanism that translates shifts of driving means into lateral and axial movements of the elements, allowing variable power adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing accommodating intraocular lenses use only cubic surfaces or only spherical surfaces, then the lens construction is simpler, but the variable focus power capability is limited
Solution Approach 1:
The patent combines cubic optical surfaces and spherical optical surfaces in a single intraocular lens construction. The lens comprises a first optical element with a cubic surface and a second optical element with a spherical surface, both capable of relative movement to provide variable focus power. This merging of different surface types enables enhanced adaptability and versatility in achieving variable focus while maintaining a relatively integrated lens structure.
2Adaptability or versatility
If multiple optical elements are used to achieve variable focus power, then the optical accommodation is enhanced, but the device complexity increases
Solution Approach 1:
The patent employs dynamic movement between optical elements to achieve variable focus. The first optical element with cubic surface and the second optical element with spherical surface can move relative to each other along the optical axis, enabling the lens to dynamically adjust its focal power. This dynamic configuration enhances optical accommodation while the elements remain part of an integrated lens assembly, balancing complexity.
3Ease of operation
If fluid-filled variable lenses are used, then the variable power adjustment is smooth, but the manufacturing precision requirements increase
Solution Approach 1:
The patent utilizes changes in the physical state or properties of materials to achieve variable focus. Specifically, it employs materials with different refractive indices or optical densities that can change their optical parameters in response to environmental conditions or applied forces. This approach enables smooth variable power adjustment through controlled parameter changes while maintaining manufacturable optical surfaces with standard precision requirements.
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 construction provides enhanced optical accommodation and refraction capabilities by varying focal power based on lateral and axial shifts, restoring natural lens functions and correcting aberrations, suitable for use as an add-on lens or full replacement.
Implementation Method 1
at least one elastic haptic
Data Source
AI summary
Accommodating intraocular lenses with a combination of variable power lenses including, firstly, a variable lens with cubic surfaces fitted onto two optical elements to vary focal power by lateral shift of the elements and, secondly, a variable lens with spherical lenses fitted onto the same elements to vary focal power by axial shift of the elements. A mechanical construction with hinges provides both the shifts of the elements.