Customized Intraocular Lens Add Power for Presbyopia
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Solution Overview
Problem
Current multifocal intraocular lenses provide fixed add powers across the entire range of spherical equivalent powers, failing to customize vision correction for individual patients' ocular biometry and preferred reading distances, leading to suboptimal near and intermediate vision performance.
Innovation Solution
Customized multifocal intraocular lenses with optical add powers tailored to a patient's ocular biometry and preferred reading distance, calculated using formulas like Hoffer Q, Holladay I, or Haigis, and determined by the effective or actual lens position, allowing for varying add powers based on spherical equivalent power and reading distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed add powers are used across the entire spherical equivalent power range, then device complexity is reduced and manufacturing is simplified, but visual performance is suboptimal for individual patients
Solution Approach 1:
The patent applies parameter changes by varying the add power parameter based on the spherical equivalent power and patient-specific ocular biometry parameters. Instead of using a fixed add power, the lens power parameters are adjusted according to calculated values derived from Hoffer Q, Holladay I, or Haigis formulas, optimizing visual performance for each patient while maintaining a systematic approach to customization.
2Reliability
If customized add powers are implemented based on ocular biometry and reading distance, then visual performance is optimized, but manufacturing complexity and device complexity increase
Solution Approach 1:
The patent applies preliminary action by performing biometric measurements and add power calculations before lens manufacturing. Ocular biometry parameters (axial length, corneal curvature, anterior chamber depth) are measured preoperatively, and the appropriate add power is calculated using established formulas, allowing the lens to be manufactured with precise specifications tailored to the patient's anatomical characteristics and visual needs.
3Adaptability or versatility
If fixed add power lenses are used, then ease of operation is maintained, but adaptability to individual patient needs is reduced
Solution Approach 1:
The patent applies universality by creating a standardized calculation framework that can be applied across different patient types and ocular biometry ranges. The same methodology (using Hoffer Q, Holladay I, or Haigis formulas to calculate add power based on spherical equivalent and biometric parameters) serves all patients, making the customization process systematic and universally applicable rather than requiring individualized manual calculations for each case.
Data Source
AI summary
Intraocular lenses with a base optical power and a customized add power. The add power is customized based on at least one of ocular biometry of an individual, position of the intraocular lens in the eye and a preferred reading distance.