Aspheric Contact Lens Fitting for Ocular Aberrations
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Solution Overview
Problem
Conventional contact lenses fail to effectively correct higher order aberrations and neuro-adaptive effects on vision, particularly spherical aberrations associated with aging, due to their focus on lower order visual acuity and neglect of cortical influences.
Innovation Solution
A method that involves comprehensive baseline measurements for low and high order aberrations, including cortical influences, to select and fit aspheric contact lenses that correct substantially all spherical aberrations, using Zernike polynomials and contrast sensitivity functions to account for individual visual needs and aging changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional contact lenses are used to correct lower order aberrations, then visual acuity is improved, but higher order aberrations and neuro-adaptive effects remain uncorrected
Solution Approach 1:
The correction is divided into multiple components: lower order aberration correction (sphere and cylinder), higher order aberration correction (spherical aberration), and neuro-adaptive correction (cortical influences). Each component is measured and corrected separately through a systematic fitting process that addresses each aspect of visual performance independently before combining them into a comprehensive correction strategy.
Solution Approach 2:
The invention extends the correction from traditional two-dimensional refraction (sphere and cylinder) to include higher order dimensional parameters such as spherical aberration coefficients and cortical adaptation factors. This multi-dimensional approach allows simultaneous correction of multiple aberration types that were previously addressed separately or not at all.
2Object-affected harmful factors
If aspheric contact lenses are used to reduce spherical aberrations, then up to 60% of spherical aberrations are corrected, but neuro-adaptive effects are still ignored
Solution Approach 1:
The fitting method incorporates feedback loops where the patient's subjective visual experience and objective measurements are continuously evaluated. The cortical adaptation component provides feedback about how the visual cortex processes the corrected image, allowing adjustments to be made to optimize not just optical quality but also neural processing efficiency. This feedback mechanism ensures both spherical aberration correction and neuro-adaptive considerations are addressed.
3Reliability
If comprehensive measurements including cortical influences are taken, then all aberrations can be corrected, but the fitting process becomes more complex
Solution Approach 1:
All necessary measurements including lower order refraction, higher order aberrations, and cortical adaptation assessments are performed during the initial comprehensive eye examination. This preliminary data collection establishes a complete baseline that guides the entire fitting process, eliminating the need for multiple iterative adjustments and simplifying subsequent lens selection and fitting steps.
Data Source
AI summary
The invention provides a method of fitting lenses that results in correction of not only low and high order ocular aberrations, but that additionally provides correction for the effects of cortical influences, or neuro-adaptive influences.