Phakic Intraocular Lens Vault Prediction with Sulcus Measurements
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Solution Overview
Problem
Existing methods for determining the size of phakic intraocular lenses (ICL) in posterior chamber phakic intraocular lens implantation suffer from low predicting accuracy and precision, leading to insufficient or excessive Vault, which increases the risk of postoperative complications and the need for secondary operations.
Innovation Solution
A method and electronic device that utilize sulcus-to-sulcus data to calculate the Vault by formulas (1) and (2) for predicting the Vault, incorporating lens thickness influence factors, and adjusting ICL size and position to ensure the Vault meets a predetermined threshold, thereby improving predicting accuracy and precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional methods are used to determine ICL size, then the operation can be performed, but the predicting accuracy of Vault is low leading to insufficient or excessive Vault
Solution Approach 1:
The patent changes the measurement parameters from traditional white-to-white (WTW) estimation to direct sulcus-to-sulcus (STS) data measurement. By using STS data obtained through ultrasonic biomicroscope or biometer, and incorporating lens thickness measurements, the patent transforms the prediction methodology to achieve higher accuracy in Vault prediction, thereby reducing postoperative complications
Solution Approach 2:
The patent performs preliminary calculation of the effective STS value at the axial position of the ICL lens before the actual implantation. By pre-calculating the Vault using the formula h=(ICL Size-STS)^0.7 and adjusting for lens thickness influence, the surgeon can select the appropriate ICL size in advance, avoiding the need for secondary operations
2Manufacturing precision
If secondary operation is performed to adjust Vault, then the Vault can be corrected, but the physical burden of patient increases by several times
Solution Approach 1:
The patent emphasizes preliminary calculation and selection of ICL size before implantation. By using the established formula Vault=h-LTF where h=(ICL Size-STS)^0.7 and LTF=LT÷10+0.16, the optimal ICL size can be determined in advance, preventing the need for secondary corrective operations and thereby reducing patient burden
3Manufacturing precision
If ICL replacement is performed for Vault adjustment, then the Vault can be corrected, but the difficulty coefficient increases making it difficult to replace
Solution Approach 1:
The patent performs preliminary calculation of the effective STS value and predicted Vault before ICL selection. By using the formula system that incorporates STS data, lens thickness, and ICL size, the correct ICL can be selected on the first attempt, avoiding the complex and difficult secondary operation of ICL replacement
Solution Approach 2:
The patent establishes a feedback mechanism where the predicted Vault is compared against the threshold (0.5-1.0mm). If the predicted Vault does not meet the threshold, the ICL size and axial position are updated and the calculation is repeated, ensuring optimal selection before implantation and eliminating the need for complex replacement procedures
Data Source
AI summary
Provided are a method for predicting a Vault after phakic intraocular lens and an electronic device. After a thickness of a to-be-corrected crystalline lens, and a horizontal sulcus-to-sulcus value and a vertical sulcus-to-sulcus value corresponding to the to-be-corrected crystalline lens are obtained, a diameter ICL Size and an axial position ICL Ax of a preset ICL lens are collected, an effective sulcus-to-sulcus value, a lens thickness influence factor LTF, a Vault chord height h and the Vault are sequentially calculated according to the obtained data, and whether the diameter ICL Size and the axial position ICL Ax of the currently adopted ICL lens meet the Vault requirement or not is judged according to the Vault. The predicting accuracy and precision of a lens position after ICL lens implantation is reduced, postoperative complications are reduced, and the convenience of clinical operation and the safety of ICL operation are improved.