Corneal Periphery Modification for Reduced Spherical Aberration
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Solution Overview
Problem
Refractive eye surgeries like LASIK can induce spherical aberrations, affecting night vision due to factors such as biomechanical effects and inappropriate treatment algorithms, which conventional techniques struggle to adequately address.
Innovation Solution
A scalable method using a single parameter periphery modification function (PMF) to adjust treatment targets point-by-point, increasing mid-periphery ablation and decreasing far-periphery ablation, with the PMF strength determined via simulation to minimize spherical aberration induction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional treatment algorithms are used for refractive eye surgery, then the treatment can be applied with existing systems, but spherical aberrations are induced that affect night vision
Solution Approach 1:
The patent applies local quality by modifying the treatment algorithm to apply different ablation amounts to different regions of the cornea. Specifically, the periphery modification function adjusts the treatment intensity in the mid-periphery versus the far-periphery, creating region-specific treatment zones that address spherical aberration while maintaining overall vision correction effectiveness.
Solution Approach 2:
The patent implements parameter changes by introducing a periphery modification function that alters the treatment parameters (ablation depth and distribution) based on radial distance from the visual axis. This function modifies key parameters including mid-periphery ablation amount, far-periphery ablation amount, and the transition between these regions, thereby controlling spherical aberration induction.
2Reliability
If periphery modification is applied to reduce spherical aberration, then vision quality improves, but the treatment algorithm becomes more complex
Solution Approach 1:
The patent uses an intermediary approach by introducing a periphery modification function as a mediator between the base treatment algorithm and the final treatment delivery. This function serves as a computational layer that processes the base treatment values and applies region-specific adjustments, thereby reducing spherical aberration without requiring complete redesign of the entire treatment system.
Solution Approach 2:
The patent applies segmentation by dividing the corneal treatment area into distinct radial zones (mid-periphery and far-periphery) with different ablation characteristics. This segmentation allows the complex problem of spherical aberration correction to be broken down into manageable regional adjustments, simplifying the overall algorithm structure while achieving improved optical outcomes.
3Object-generated harmful factors
If mid-periphery ablation is increased and far-periphery ablation is decreased, then spherical aberration is reduced, but the treatment requires precise regional control
Solution Approach 1:
The patent implements preliminary action by pre-calculating the periphery modification function values for all treatment points before actual ablation begins. The function determines the appropriate ablation amount for each radial zone in advance, allowing the treatment system to execute precise regional control through straightforward calculation and application of predetermined modification factors during the surgical procedure.
Data Source
AI summary
A system for determining a vision treatment for an eye of a patient is provided which includes a memory and a processor, in communication with the memory, configured to receive a first treatment target corresponding to a first target shape of a surface of the eye, obtain a periphery modification function (PMF), determine a second treatment target corresponding to a second target shape of the surface of the eye by multiplying, for each of a plurality of points on the surface of the eye, the PMF by the first treatment target, and scale the second treatment target using a scaling factor such that values of the second treatment target are scaled to be greater at a mid-periphery of the eye and scaled to be lower at a far-periphery of the eye. A treatment parameter of a treatment applied to the surface of the eye is controlled by the scaled second treatment target.