Vision Simulation for Pseudophakic Patients via Double-Pass Correction
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Solution Overview
Problem
Current vision simulation technologies face challenges in accurately simulating the vision of patients with cataracts or intraocular lenses, as the simulated images are presented on flat screens, which do not accurately replicate the eye optics of both the patient and the viewer, leading to a double-pass effect that distorts the perceived image.
Innovation Solution
A system that generates a simulated image by creating a composite image with multiple layers representing objects at different viewing distances, applying a patient eye model to simulate how light is focused by the patient's optics, and then applying a modified viewer eye model to counteract the double-pass effect, ensuring the image is viewed at a specific distance and magnification to replicate the patient's vision accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a simulated image is presented on a flat screen to show patient vision, then the simulation can be viewed by users, but the eye optics of both the patient and viewer are not accurately replicated, causing a double-pass effect that distorts the perceived image
Solution Approach 1:
The patent applies preliminary anti-action by pre-compensating for the double-pass effect through mathematical modeling. The system calculates the combined optical transfer function of both the patient's eye and the viewer's eye, then applies an inverse filter to pre-correct the simulated image before display. This anticipatory correction eliminates the distortion that would otherwise occur when the image passes through both eye optics sequences.
Solution Approach 2:
The patent introduces an intermediary mathematical model that represents the combined optical characteristics of both the patient's and viewer's eyes. This intermediary model serves as a mediator between the original scene and the final displayed image, allowing the system to simulate and correct the double-pass effect by computing the composite optical transfer function and applying appropriate corrections through signal processing.
2Device complexity
If a flat screen is used to display simulated vision, then the device complexity is reduced, but the ability to accurately replicate patient eye optics is compromised
Solution Approach 1:
The patent replaces complex mechanical optical simulation systems with a computational approach. Instead of using physical optical components to replicate eye optics, the system uses mathematical models and digital signal processing to simulate the optical transfer functions of both the patient's and viewer's eyes. This substitution of mechanical/optical systems with computational methods reduces device complexity while maintaining simulation accuracy.
Solution Approach 2:
The patent employs parameter changes by dynamically adjusting the mathematical parameters representing eye optics characteristics. The system modifies the optical transfer function parameters based on individual patient data (pupil size, lens power, aberrations) and viewer characteristics, allowing accurate simulation of different eye conditions without requiring physical customization of optical components.
Data Source
AI summary
Systems and methods are presented for providing a vision simulation of a patient who has an eye condition. A composite image representing a real-world scene is obtained. The composite image includes multiple image layers, where each image layer represents objects that are at a particular viewing distance in the real-world scene. A first eye model representing the eye optics of the patient is generated. A second eye model representing the eye optics of a viewer is generated. The second eye model is modified by performing a mathematical function. A simulated image representing the vision of the patient is generated by convolving the first eye model and the modified second eye model with the composite image. In some embodiments, a tone mapping algorithm may also be applied to the simulated image to simulate a nighttime scene.