Toric IOL Alignment via Radial Guide Overlay
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The alignment of toric intraocular lenses during cataract surgery is prone to errors due to cyclorotation, leading to incomplete astigmatism correction, and existing marking techniques are invasive and inaccurate.
Innovation Solution
A method and system that use a radial alignment guide displayed on an image of the eye, with a processor to locate the pupil center and overlay a radial grid for accurate IOL alignment, reducing the risk of cyclorotation errors by providing a precise angular reference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional marking techniques (markers or puncturing devices) are used to mark the eye with the meridian and pre-calculated IOL axis, then the surgeon can reference the alignment during surgery, but the markings may be inaccurate, wash away, drift, or carry infection risk
Solution Approach 1:
The patent creates a virtual copy of the eye's anatomical features and pre-calculated IOL axis using image processing software. Instead of physically marking the eye, the system generates a digital representation that displays the precise meridian and IOL alignment axis, providing a stable and accurate reference without the drawbacks of physical markings
Solution Approach 2:
The patent replaces the mechanical marking system (markers or puncturing devices) with an optical/digital system. The system uses image capture, processing, and display to present alignment information, eliminating the need for physical corneal markings and their associated inaccuracies and infection risks
2Ease of manufacture
If the calculated IOL angle is based on pre-operative measurements with the patient sitting upright and alert, then the alignment can be pre-planned, but cyclorotation occurs during surgery when the patient is in the supine position, causing misalignment
Solution Approach 1:
The patent performs preliminary image capture and processing during the pre-operative examination to establish the IOL axis alignment. By capturing images and calculating the IOL axis before surgery, the system prepares alignment guidance in advance, which then can be referenced during the surgical procedure to maintain accuracy despite position changes
Solution Approach 2:
The patent provides feedback by displaying the pre-calculated IOL axis and meridian information on captured eye images during or after the pre-operative examination. This visual feedback allows the surgeon to verify and adjust the alignment plan, compensating for potential cyclorotation effects during surgery
Data Source
AI summary
A method for generating a radial alignment guide for an eye includes collecting preoperative alignment data relative to a pupil from an eye that is not dilated. The method also includes locating a pupil center of the eye while dilated. The method further includes displaying the alignment data on an image of the dilated eye relative to the pupil center. In particular embodiments, software embodied in a computer-readable medium is executable by a processor to perform the steps of such a method.