Calculation formulas and influence factors of effective lens position
10.3760/cma.j.cn115989-20220304-00088
- VernacularTitle:人工晶状体有效位置的计算及影响因素
- Author:
Sijin HE
1
;
Qiang WU
Author Information
1. 上海交通大学医学院附属第六人民医院眼科，上海 200233
- Keywords:
Cataract;
Lenses, intraocular;
Lens implantation, intraocular;
Effective lens position;
Calculation formulas;
Influence factors;
Review
- From:
Chinese Journal of Experimental Ophthalmology
2023;41(6):598-602
- CountryChina
- Language:Chinese
-
Abstract:
Cataract extraction is often combined with the implantation of intraocular lens (IOL) with the diopter matching the operated eye to restore optimal visual function after surgery.However, there are often errors between the actual refractive power of the operated eye and the predicted value.One of the major causes of postoperative refractive error is the change in IOL position compared with the expected position.In order to improve the accuracy of postoperative refraction prediction, Holladay proposed to introduce the concept of effective lens position (ELP) into the IOL diopter calculation formula.The differences in the parameters and algorithms incorporated in the calculation of ELP lead to differences in the accuracy of IOL calculation formulas.With the application of multi-parameter calculation methods, especially the formula based on the artificial intelligence algorithm, the accuracy of IOL calculation formula has been significantly improved.ELP is also affected by various factors such as differences in ocular anatomy, IOL design and material, and surgical procedures, especially the factors affecting the stability of the capsular bag that increase the difficulty of accurately predicting ELP.Therefore, the changes in postoperative ELP need to be further discussed in order to obtain more accurate postoperative refraction.This article aimed to give a review of the development of calculation formulas and the influencing factors of ELP.
