子午线(天文学)
医学
人工晶状体
散光
眼科
角膜
角膜地形图
验光服务
光学
物理
天文
作者
Hun Lee,Tae Im Kim,Eung Kweon Kim
出处
期刊:Current Opinion in Ophthalmology
[Ovid Technologies (Wolters Kluwer)]
日期:2015-01-01
卷期号:26 (1): 34-38
被引量:24
标识
DOI:10.1097/icu.0000000000000119
摘要
Purpose of review Corneal astigmatism is a common refractive error observed in a significant percentage of cataract patients. Accurate measurements of the preexisting corneal astigmatism are essential in order to achieve the desired refractive outcome after toric intraocular lens (IOL) implantation. This article presents a comprehensive review of recent published literatures on methods for measuring preoperative corneal astigmatism for toric IOL implantation. Recent findings A variety of instruments has been introduced and used to measure the magnitude and meridian of corneal astigmatism during preoperative assessments of cataract patients. Instruments that consider both the anterior and posterior corneal surfaces as critical factors for measuring total corneal astigmatism are expected to provide better accuracy. Although these instruments facilitate improved evaluations of corneal astigmatism and have helped minimize postoperative residual astigmatism, a perfect method to analyze preoperative corneal astigmatism has not yet been established. Summary Perfect correction of astigmatism after toric IOL implantation by using accurate corneal astigmatism values is the goal of this surgical procedure. To achieve this, correct and precise measurements of corneal astigmatism to determine the magnitude and meridian should be obtained.
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