Deformable Intraocular Lens Accommodation Aberration Control
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Solution Overview
Problem
Current intraocular lenses that aim to provide accommodation often result in undesirable optical aberrations, such as spherical aberrations, due to the shape changes during accommodation, limiting their effectiveness in providing both distant and near vision without compromising optical quality.
Innovation Solution
The development of an intraocular lens system comprising a deformable optic and a rigid optic, with a support structure that allows the deformable surface to change shape in response to ocular forces, incorporating a stiffening layer and a relief portion to minimize aberrations, and configured to change optical power by at least 1 Diopter, enabling flexible design for both accommodative and disaccommodative states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the intraocular lens uses a deformable optic to provide accommodation, then the ability to provide both distant and near vision is improved, but optical aberrations such as spherical aberrations increase
Solution Approach 1:
The patent applies local quality by creating a deformable optic with non-uniform material properties - specifically, a gradient index (GRIN) structure where the refractive index varies radially from the optical axis. This allows different regions of the lens to have different optical characteristics, enabling accommodation through shape change while maintaining control over optical aberrations through the tailored refractive index distribution.
Solution Approach 2:
The patent employs composite materials by combining the deformable optic made of elastomeric material with gradient refractive index properties with a rigid optic or capsular support structure. This composite construction allows the deformable portion to change shape for accommodation while the rigid or structured support maintains optical quality and reduces aberrations.
2Adaptability or versatility
If the deformable optic changes shape significantly to provide accommodation, then the optical power change is improved, but the structural stability and optical quality deteriorate
Solution Approach 1:
The patent applies segmentation by dividing the intraocular lens into distinct functional zones - a central deformable optic region that changes shape for accommodation and a peripheral rigid optic or capsular support structure that maintains stability. This segmentation allows significant shape change in the deformable region while the rigid support preserves overall structural integrity and optical quality.
Solution Approach 2:
The patent utilizes parameter changes by employing materials with specific elastomeric properties that allow controlled deformation within certain parameter ranges. The deformable optic is designed to change shape within specific limits that provide sufficient accommodation (optical power change) while staying within parameters that maintain structural stability and prevent excessive distortion.
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
This design effectively reduces optical aberrations and provides flexible accommodation by changing the optical power of the intraocular lens, allowing for clear distant and near vision while maintaining optical quality, with the ability to change shape in response to ocular forces.
Implementation Method 1
a deformable optic disposed about an optical axis comprising a solid material and a deformable surface; a support structure operably coupled to at least one of the optics for pressing the deformable surface and the rigid surface together in response to the application or removal of an ocular force, whereby at least a portion of the deformable surface changes shape
Implementation Method 2
characterised by further comprising a stiffening layer that is stiffer than the deformable optic, the deformable optic being disposed between the stiffening layer and the rigid optic
Implementation Method 3
an intraocular lens, comprising: a deformable optic disposed about an optical axis comprising a solid material and a deformable surface; a rigid optic disposed about the optical axis comprising a solid material and a rigid surface
Data Source
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AI summary
An intraocular lens includes a deformable optic, a rigid optic, and a support structure. The deformable optic is disposed about an optical axis and comprises a solid material and a deformable surface. The rigid optic is disposed about the optical axis and comprises a solid material and a rigid surface. The support structure is operably coupled to at least one of the optics for pressing the deformable surface and the rigid surface together in response to or in the absences of an ocular force, whereby at least a portion of the deformable surface changes shape such that the optical power of the at least a portion of the deformable surface and/or the intraocular lens changes by at least 2 Diopter.