Intraocular Lens Elastic Mask Material Compatibility
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Solution Overview
Problem
Intraocular lenses (IOLs) with embedded masks face challenges in maintaining optical performance due to incompatible material properties, such as modulus of elasticity and coefficient of thermal expansion, which can lead to deformation and displacement during implantation and manufacturing processes, affecting presbyopia correction and depth of focus.
Innovation Solution
Designing IOLs with masks embedded within or secured to the lens body, where the mask material has a modulus of elasticity and coefficient of thermal expansion within 30% of the lens material, and using materials like silicone or acrylic, to ensure compatibility and maintain optical performance during deformations and temperature differentials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mask is embedded within or secured to a lens body to improve depth of focus, then depth of focus is improved, but material incompatibility (modulus of elasticity and coefficient of thermal expansion differences) causes deformation and displacement during implantation and manufacturing
Solution Approach 1:
The patent applies parameter changes by carefully selecting and matching the physical parameters of the mask material to the lens material. Specifically, the mask material is chosen to have a modulus of elasticity within 30% of the lens material and a coefficient of thermal expansion within 30% of the lens material. This parameter matching ensures that both materials respond similarly to mechanical and thermal stresses during implantation and manufacturing, preventing deformation and displacement of the mask while maintaining its position and shape stability.
Solution Approach 2:
The patent employs composite materials by combining the mask material and lens material into a single intraocular lens structure. The mask is either embedded within or secured to the lens body, creating a composite device where two different materials work together. By selecting materials with compatible mechanical and thermal properties, the composite structure maintains integrity and prevents relative movement between components during implantation and manufacturing processes.
2Stability of the object's composition
If mask material properties are made compatible with lens material (within 30% modulus of elasticity and coefficient of thermal expansion), then deformation and displacement are minimized, but material selection becomes more constrained
Solution Approach 1:
The patent establishes specific parameter ranges (modulus of elasticity within 30% and coefficient of thermal expansion within 30%) that define compatibility between mask and lens materials. These parameter specifications provide clear design criteria that guide material selection while ensuring stable performance. The defined ranges balance the need for material compatibility with reasonable design flexibility, allowing multiple material combinations that meet the performance 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 IOLs with embedded masks achieve consistent pre-injection and post-injection optical performance, improving depth of focus and reducing defects in non-distance vision, while minimizing deformation and displacement issues.
Implementation Method 1
the mask can include a mask material having a modulus of elasticity that is within about 30 percent of a modulus of elasticity of the lens material
Implementation Method 2
the mask can include a mask material having a coefficient of thermal expansion that is within about 30 percent of the coefficient of thermal expansion of the lens material
Data Source
AI summary
Intraocular implants and methods of making intraocular implants are provided. The intraocular implant can include a lens body having a lens material and a mask having a mask material. The lens body can be secured to the mask. The mask material can include a modulus of elasticity that is greater than or equal to a modulus of elasticity of the lens material.