Intraocular Lens Tilt Compensation via OCT and Movable Fixation Target
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Solution Overview
Problem
Existing intraocular lenses (IOLs) face challenges in post-implant adjustment due to potential tilt, making it difficult for clinicians to accurately adjust the IOL to compensate for changes in the eye or errors in pre-operative biometry.
Innovation Solution
The use of optical coherence tomography (OCT) guidance and a moveable fixation target to align the transverse plane of the IOL perpendicular to the optical axis of the ophthalmic system, allowing for precise adjustment of the IOL tilt and base power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional IOLs are used, then the eye can focus at a fixed distance, but the subject requires glasses for other activities and cannot accommodate to different focal lengths
Solution Approach 1:
The patent applies dynamics by making the IOL adjustable through laser treatment. The IOL transitions from a static fixed-focus design to a dynamic adjustable design where the optical power can be modified post-implantation. This allows the lens to adapt to different focal requirements through controlled laser-induced changes in the IOL's physical properties.
Solution Approach 2:
The patent changes the parameter of optical power of the IOL through laser treatment. By modifying the IOL's optical parameters (such as curvature or thickness) using laser energy, the system enables adjustment of focal length and optical power, transforming the IOL from a fixed-parameter device to one with variable optical characteristics.
2Measurement precision
If IOL adjustment is performed without OCT guidance, then the procedure is simpler, but the accuracy and safety of adjustment is reduced due to potential tilt
Solution Approach 1:
The patent implements feedback by using OCT imaging to visualize the IOL's position and orientation in real-time during the adjustment procedure. The OCT guidance system provides visual feedback about the IOL's tilt and alignment status, allowing the clinician to monitor and adjust the laser treatment parameters based on actual IOL positioning, thereby improving accuracy while managing complexity through informed control.
Solution Approach 2:
The patent uses OCT imaging as an intermediary between the laser treatment system and the IOL. The OCT system acts as a mediator that provides detailed visual information about the IOL's state, enabling precise control of the laser adjustment process. This intermediary imaging system allows accurate assessment of IOL tilt and alignment without directly complicating the core adjustment mechanism.
3Adaptability or versatility
If the fixation target is stationary, then the alignment process is simpler, but the ability to compensate for IOL tilt is limited
Solution Approach 1:
The patent applies dynamics by making the fixation target movable rather than stationary. The movable fixation target allows the system to dynamically adjust and compensate for IOL tilt by moving the target in response to detected tilt conditions. This dynamic adaptation enables the alignment procedure to account for varying IOL orientations, improving tilt compensation capability while maintaining operational simplicity through automated or guided movement.
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
This method enables safe and accurate adjustment of IOLs, improving post-operative vision by compensating for tilt and allowing for dynamic adjustment of the IOL's optical power.
Implementation Method 1
capturing one or more OCT images of an eye of a subject using an OCT imaging apparatus
Implementation Method 2
directing a laser beam generated by a laser of the ophthalmic system at the IOL to adjust a base power of the IOL
Data Source
AI summary
Disclosed herein are systems and methods for compensating for a tilt of an intraocular lens (IOL) and systems and methods for adjusting the IOL. For example, one of the methods can comprise capturing one or more optical coherence tomography (OCT) images of an eye of a subject when the IOL is implanted within the eye of the subject. The method can also comprise generating a fixation target such that the fixation target is visible to the eye of the subject and moving the fixation target until a transverse plane of the IOL is perpendicular or substantially perpendicular to an optical axis of an ophthalmic system. The method can also comprise directing a laser beam generated by a laser of the ophthalmic system at the IOL.