Aspheric IOLs with Constant Conic Constants
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Solution Overview
Problem
Current intraocular lenses (IOLs) fail to provide optimal visual performance due to material limitations, optical characteristics, placement accuracy, and stability issues, leading to residual spherical aberrations and misalignment, which affect image quality and require complex selection and labeling processes for surgeons.
Innovation Solution
Development of aspheric IOLs with specific surface shapes and conic constants that minimize inherent spherical aberration, allowing for consistent labeling and selection based on lens power and A-constant, and incorporating diffractive or Fresnel surfaces to control physical characteristics and reduce manufacturing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If spherical surfaces are used in IOLs, then manufacturing is simpler, but spherical aberration increases
Solution Approach 1:
The patent applies aspheric surfaces with specific conic constants to the IOL design. The aspheric surfaces replace traditional spherical surfaces to eliminate inherent spherical aberration while maintaining manufacturability through standardized design parameters and consistent labeling systems.
2Reliability
If aspheric surfaces with zero spherical aberration are used, then visual performance improves, but sensitivity to misalignment increases
Solution Approach 1:
The patent optimizes aspheric parameters including conic constants and surface profiles to achieve zero spherical aberration while controlling sensitivity to misalignment. The design balances multiple parameters to reduce both spherical aberration and coma, providing robust visual performance.
3Adaptability or versatility
If multiple IOL designs with different spherical aberration values are available, then adaptability improves, but selection complexity increases
Solution Approach 1:
The patent creates a unified IOL platform with consistent labeling and selection parameters that can accommodate different aspheric designs. The standardized system allows surgeons to select appropriate lenses based on consistent criteria rather than navigating multiple complex labeling systems.
4Manufacturing precision
If aspheric IOLs are designed to minimize spherical aberration, then image quality improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent establishes standardized aspheric parameters and conic constants that optimize image quality while remaining manufacturable. The consistent labeling system and standardized designs reduce manufacturing complexity compared to custom aspheric surfaces.
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 aspheric IOLs minimize residual spherical aberrations and misalignment-induced errors, improving visual performance and simplifying surgical selection processes by maintaining consistent labeling and reducing regulatory burdens.
Implementation Method 1
an aspheric lens for use in an optical system, in which the lens has physical and optical characteristics that control the spherical aberration in a wavefront passing through the lens
Implementation Method 2
incorporating diffractive or Fresnel surfaces to control physical characteristics and reduce manufacturing complexity
Data Source
AI summary
In an embodiment, an aspheric IOL for use in a pseudophakic ocular system has no inherent spherical aberration. An embodiment of the invention is directed to a family of aspheric IOLs in which a lens constant, such as the well known A-constant, is kept constant throughout the family of lenses. An embodiment of the invention is directed to a multi-component accommodating intraocular lens (A-IOL) having substantially no inherent spherical aberration. An embodiment of the invention is directed to a family of member A-IOLs where each member A-IOL has a first (1) surface and a fourth (4) surface characterized by a radius and a conic constant that remain substantially constant over the power rage of the A-IOL family.