Intraocular Lens Optical Property Prediction
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Solution Overview
Problem
Conventional methods cannot accurately determine the optical properties of a patient eye with an intraocular lens during surgery due to interfering factors and the time it takes for the lens's properties to stabilize, which is crucial for ensuring desired visual performance.
Innovation Solution
A method that involves determining measured values of optical properties shortly after lens injection and comparing them to a pre-established time profile of the lens's properties, allowing for accurate prediction of final optical properties using exponential functions or tables, enabling adjustments during surgery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If intraoperative measurement is performed shortly after lens injection, then measurement time is reduced and surgical efficiency is improved, but measurement precision deteriorates due to incomplete lens unfolding and changing optical properties
Solution Approach 1:
The patent applies preliminary action by pre-determining the time profile of optical property changes through separate experimental measurements. This time profile, obtained before surgery, is then used to correct intraoperative measurements taken at any time point during lens unfolding, allowing accurate final optical property determination without waiting for complete stabilization
Solution Approach 2:
The patent implements feedback by using the pre-determined time profile to correct real-time measurements. The measured optical properties at any time point are adjusted based on the known time-dependent behavior, providing feedback that compensates for the incomplete unfolding state and yields accurate final values
2Measurement precision
If measurement is delayed until lens optical properties stabilize, then measurement precision is improved, but surgical time is extended beyond the 5-10 minute cataract surgery window
Solution Approach 1:
The time profile characterization is performed as a preliminary action before surgery, separating the time-consuming stabilization process from the actual surgical procedure. This allows intraoperative measurements to be taken immediately without extending surgical time, while the pre-obtained time profile enables accurate correction of these early measurements
3Ease of operation
If conventional measurement methods are used during surgery, then ease of operation is maintained, but measurement reliability deteriorates due to interfering factors including lens deformation and surgical disturbances
Solution Approach 1:
The patent introduces a time profile as an intermediary element that mediates between the simple but unreliable intraoperative measurements and the accurate but time-consuming postoperative measurements. This intermediary time profile, derived from separate experiments, allows the system to use simple intraoperative measurements while achieving reliable final optical property values through correction
Data Source
AI summary
A method determines an optical property (S, C) of a patient eye with an intraocular lens. The patient eye and the intraocular lens define a system. In the method, a measured value of the optical property of the system is determined at a measurement time (tM) after injecting the intraocular lens into the patient eye. The measured value and the associated measurement time (tM) are compared to a known time profile of the values of the optical property for the lens. The known time profile since unfolding the intraocular lens was determined experimentally before the lens is injected and is made available in the form of measurement series or data derived therefrom. A value for the optical property of the system is determined at a different time than the measurement time (tM), according to the known time profile of the values of the optical property for the lens.