首页
内分泌科 神经内科 心血管内科 消化内科 风湿免疫科 血液科 肾内科 呼吸内科 神经外科 心脏外科 胸部外科 普通外科 肝胆外科 烧伤外科 整形外科 泌尿外科 妇产科 儿科 皮肤性病科 感染科 眼科 急诊科 精神科 口腔科 肿瘤科 骨科 耳鼻咽喉头颈外科
疾病 检查 药品 操作 文献 专题 路径 法规 量表

您的账号已在其他设备登录，您当前账号已强迫下线，
如非您本人操作，建议您在会员中心进行密码修改

确定
首页 > Oman journal of ophthalmology > Accuracy of intraocular lens power calculation in high myopia.
Accuracy of intraocular lens power calculation in high myopia.
LinkOut
收藏 | 浏览72

To study the accuracy of different recent intraocular lens (IOL) calculation formulas in predicting a target postoperative refraction ± 1.0D (Diopters) in patients with long eyes (axial length ≥ 26.0 mm) undergoing phacoemulsification.This study comprised 127 eyes of 87 patients who presented with cataract and axial eye length ≥ 26 mm. Before phacoemulsification and IOL implantation; axial length measurement using immersion ultrasound A-scan technique, and autokeratometry with or without computerized corneal topography for K readings were done. The IOL power was calculated using four formulas, namely the SRK-T, Hoffer-Q, Holladay-2, and Haigis formulas. Four months after surgery, refraction was done. Differences between actual postoperative refraction and assumed target refraction using the different formulas were analyzed. P < 0.05 was considered statistically significant.In all 127 eyes, the mean axial length was 31.71 mm (range, 26.06-37.11 mm) and the mean K was 44.68 D (range, 40.05-55.14D). The mean preoperative spherical equivalent (SE) was -17.52D (range, -12.25 to -30.50D). After surgery, the mean spherical equivalent was -0.8 ± 0.83D (range, +1.25 to -3.75D). The mean postoperative refractive SE when implanting a plus power IOLs was -0.3 ± 0.51D (P < 0.001) while the mean postoperative refractive SE when implanting a minus power IOLs was +1.21 ± 0.11D denoting a highly significant tendency toward hyperopia (P < 0.001). Concerning the minus power group, most postoperative refractive error was within +1.0 to +2.0D in the actual implanted IOL and in all other formula calculated IOL power. However, Haigis formula showed the least deviation while SRK-T and other formulas showed a greater tendency toward hyperopia.In eyes with high axial myopia, the performance of SRK-T, Hoffer-Q, Holladay-2 and Haigis formulas are comparable in low plus-powered IOL implantation. Haigis formula is the best formula when minus power IOL is implanted.

作者：Asaad A, Ghanem；Hosam M, El-Sayed

来源：Oman journal of ophthalmology 2010 年 3卷 3期

循证预后
知识库介绍

临床诊疗知识库该平台旨在解决临床医护人员在学习、工作中对医学信息的需求，方便快速、便捷的获取实用的医学信息，辅助临床决策参考。该库包含疾病、药品、检查、指南规范、病例文献及循证文献等多种丰富权威的临床资源。

详细介绍
热门关注
免责声明：本知识库提供的有关内容等信息仅供学习参考，不代替医生的诊断和医嘱。

Accuracy of intraocular lens power calculation in high myopia.
收藏
| 浏览：72
作者：
Asaad A, Ghanem；Hosam M, El-Sayed
来源：
Oman journal of ophthalmology 2010 年 3卷 3期
标签：
High myopia intraocular lens power calculation phacoemulsification
To study the accuracy of different recent intraocular lens (IOL) calculation formulas in predicting a target postoperative refraction ± 1.0D (Diopters) in patients with long eyes (axial length ≥ 26.0 mm) undergoing phacoemulsification.This study comprised 127 eyes of 87 patients who presented with cataract and axial eye length ≥ 26 mm. Before phacoemulsification and IOL implantation; axial length measurement using immersion ultrasound A-scan technique, and autokeratometry with or without computerized corneal topography for K readings were done. The IOL power was calculated using four formulas, namely the SRK-T, Hoffer-Q, Holladay-2, and Haigis formulas. Four months after surgery, refraction was done. Differences between actual postoperative refraction and assumed target refraction using the different formulas were analyzed. P < 0.05 was considered statistically significant.In all 127 eyes, the mean axial length was 31.71 mm (range, 26.06-37.11 mm) and the mean K was 44.68 D (range, 40.05-55.14D). The mean preoperative spherical equivalent (SE) was -17.52D (range, -12.25 to -30.50D). After surgery, the mean spherical equivalent was -0.8 ± 0.83D (range, +1.25 to -3.75D). The mean postoperative refractive SE when implanting a plus power IOLs was -0.3 ± 0.51D (P < 0.001) while the mean postoperative refractive SE when implanting a minus power IOLs was +1.21 ± 0.11D denoting a highly significant tendency toward hyperopia (P < 0.001). Concerning the minus power group, most postoperative refractive error was within +1.0 to +2.0D in the actual implanted IOL and in all other formula calculated IOL power. However, Haigis formula showed the least deviation while SRK-T and other formulas showed a greater tendency toward hyperopia.In eyes with high axial myopia, the performance of SRK-T, Hoffer-Q, Holladay-2 and Haigis formulas are comparable in low plus-powered IOL implantation. Haigis formula is the best formula when minus power IOL is implanted.

关于我们 产品特色 专家团队

免责声明：本知识库提供的有关疾病、症状、检查、药品、指南规范、循证文献和病例文献等信息仅供医生学习参考。

2015 北京万方数据股份有限公司 互联网药品信息服务资格证书号：(京)-经营性-2011-0017 京ICP证010071号