Aspheric Intraocular Lens Power-Specific Aberration Control
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Solution Overview
Problem
Existing intraocular lens (IOL) design methods fail to accurately account for anatomical variations in axial separation, leading to inconsistent lens performance due to sensitivity of aberration corrections to the actual axial position of the IOL, resulting in variations in light convergence and vision quality.
Innovation Solution
A method that determines a power-specific axial separation parameter based on the IOL power, allowing for more accurate aberration correction by using a modified anterior chamber depth value specific to the lens power, enabling the design and manufacturing of IOLs that optimize image contrast and reduce visual disturbances like blurring and halos.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a fixed axial separation parameter is used for all IOL powers, then the design and manufacturing process is simplified, but aberration correction becomes inconsistent across different IOL powers
Solution Approach 1:
The patent applies parameter changes by transitioning from a fixed axial separation parameter to a power-specific axial separation parameter. The formula ACD = 4.5 - 0.05*(IOL Power - 20) dynamically adjusts the axial separation parameter based on the IOL power, ensuring optimal aberration correction for each specific lens power while maintaining a systematic design approach.
Solution Approach 2:
The patent implements local quality by tailoring the axial separation parameter to each specific IOL power rather than using a universal value. This allows the optical design to be locally optimized for aberration correction at each power level, addressing the specific needs of different IOL powers with customized parameters.
2Manufacturing precision
If the axial separation parameter is adjusted for each IOL power, then aberration correction accuracy is improved, but the design and manufacturing complexity increases
Solution Approach 1:
The patent manages design complexity through parameter changes by providing a clear mathematical relationship (ACD = 4.5 - 0.05*(IOL Power - 20)) that systematically determines the axial separation parameter based on IOL power. This formulaic approach, while power-specific, maintains design efficiency through a straightforward calculation method rather than requiring complex iterative optimization for each power.
3Productivity
If a nominal axial separation value is used for all patients, then the manufacturing process is streamlined, but vision quality varies due to anatomical variations
Solution Approach 1:
The patent enhances reliability of vision quality through parameter changes by adjusting the axial separation parameter according to IOL power using the formula ACD = 4.5 - 0.05*(IOL Power - 20). This power-specific parameter adjustment compensates for anatomical variations and optical differences associated with different lens powers, providing more consistent visual outcomes across patients.
4Illumination intensity
If aspheric aberration correction is implemented, then image quality is improved, but the correction becomes sensitive to axial position variations
Solution Approach 1:
The patent manages the sensitivity of aspheric aberration correction to axial position by implementing power-specific axial separation parameters. The formula ACD = 4.5 - 0.05*(IOL Power - 20) pre-compensates for the positional sensitivity by optimizing the axial separation for each IOL power, thereby maintaining high image contrast and effective aberration correction without requiring additional complex mechanisms.
Data Source
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AI summary
A method of manufacturing an intraocular lens (IOL) (102) of a selected power is described which includes determining (302) a power-specific axial separation parameter (110) for the selected power. The method also includes selecting (304) at least one aberration correction for the IOL. The method further includes designing (306) the IOL based on the power-specific axial separation parameter to produce the selected aberration correction.