Intraocular Lens Vision Testing Optics for Wide-Field Simulation
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Solution Overview
Problem
Conventional methods for testing intraocular lenses (IOLs) are limited in field of view and cannot accurately simulate the patient's subjective visual impression, especially under different viewing conditions, making it difficult to select the optimal IOL for implantation.
Innovation Solution
A device with a correcting lens, diverging lens, and collecting lens configuration, featuring concave and convex surfaces, extends the field of view and corrects defocusing and contrast errors, allowing realistic simulation of visual impressions through IOLs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a conventional optical testing device is used, then the device structure is simple, but the field of view is limited and cannot test wide viewing angles
Solution Approach 1:
The ocular optic is divided into three separate lens components: a correcting lens, a diverging lens, and a collecting lens. Each lens has specific optical functions and can be independently positioned and adjusted along the optical axis, allowing the system to achieve extended field of view while maintaining manageable structural complexity through modular assembly
Solution Approach 2:
The patent introduces angular dimension control by positioning lenses at specific distances from the optical axis (e.g., 5mm offset for diverging and collecting lenses). This spatial arrangement in multiple dimensions enables light beams from different spatial angles to be directed onto the same retinal point, achieving wide-angle testing capability without proportionally increasing overall device footprint
2Area of stationary object
If the viewing angle is increased, then the field of view is extended, but defocusing and contrast errors occur
Solution Approach 1:
Each lens in the ocular optic is designed with specific local optical properties: the correcting lens has a distal concave surface and proximal convex surface for angle-dependent correction, the diverging lens has negative focal length for beam divergence control, and the collecting lens has positive focal length for beam convergence. These localized optical characteristics work together to maintain image quality across the extended field of view
Solution Approach 2:
The system dynamically adjusts optical parameters based on viewing angle by using the correcting lens to modify the vergence of light beams depending on their incident angle. This parameter change approach allows the system to compensate for defocusing and contrast degradation that would otherwise occur at oblique viewing angles, maintaining measurement precision across the extended field of view
3Measurement precision
If computer simulation is used, then the testing process is simple, but the subjective visual impression cannot be reliably predicted
Solution Approach 1:
The device creates a physical optical copy of the patient's eye system by using a corneal optic to model the cornea and an ocular optic to represent the optical path through the eye. This physical optical model allows direct measurement of subjective visual impression through the IOL under test, providing reliable prediction that computer simulations cannot achieve
Solution Approach 2:
The ocular optic acts as an intermediary between the IOL under test and the patient's retina, enabling the transmission and manipulation of light beams to simulate actual viewing conditions. This intermediary system allows the device to measure how the IOL performs in different viewing situations, providing accurate prediction of subjective visual impression
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables testing of IOLs over a wide field of view with accurate resolution and contrast, facilitating the selection of the most suitable IOL for individual patient needs.
Implementation Method 1
the correcting lens has a distal concave lens surface and a proximal convex lens surface
Implementation Method 2
a diverging lens and collecting lens, wherein the correcting lens has a distal concave lens surface and a proximal convex lens surface
Implementation Method 3
a diverging lens and collecting lens, wherein the correcting lens has a distal concave lens surface and a proximal convex lens surface
Data Source
AI summary
A device for testing vision through an intraocular lens has a support, which supports a corneal optic, a mounting for the intraocular lens, and an ocular optic one after the other distally to proximally in a central viewing axis. The ocular optic includes, distally, a correcting lens and, proximally thereto, a diverging lens and a collecting lens, wherein the correcting lens has a distal concave lens surface and a proximal convex lens surface.