环形人工晶状体失位的数码摄影检测

Chinese Ophthalmic Research Pub Date : 2010-02-10 DOI:10.3969/J.ISSN.1003-0808.2010.02.016

Haike Guo, Haiying Jin, Hongyang Zhang

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摘要

背景环形人工晶状体(Toric IOL)是一种公认的矫正角膜散光的方法。人工晶状体轴向错位是影响人工晶状体精确对准的主要障碍，包括手术过程中人工晶状体的对准误差和人工晶状体的旋转。因此，轴向不对准角度是评价人工晶体植入效果的主要指标。目的介绍一种利用术后数码照片精确检测环状体人工晶状体错位的方法。方法采用Adobe Photoshop软件制作测量模板(极坐标)。检测环面轴的最小误差为1°(最大误差为0.5°)。回顾性分析24眼环形人工晶状体植入术的临床资料。采用旋转Scheimpflug相机(Pentacam)或狭缝扫描(Orbscan)检测角膜散光。数码复古照明图片，拍摄后瞳孔。用导出的模板对图片进行分析。然后确定最陡的角膜轴和环形人工晶状体轴。环形人工晶状体的不对准是指最陡的角膜轴与环形人工晶状体轴之间的夹角。用统计学方法分析了人工晶状体失位及其分布。结果建立了一种利用极坐标和数码照片精确检测环状体人工晶状体失位的方法。24例人工晶状体平均失位度为10.93±6.90度(0 ~ 24度)。所有病例的眼轴偏差均在25度以内，其中顺时针14眼(58.33%)，逆时针10眼(41.67%)。在本研究中，4只眼的对准角在5度以内，11只眼为5 ~ 10度，1只眼为10 ~ 15度，6只眼为15 ~ 20度，2只眼为20 ~ 25度。结论该方法对临床上人工晶状体不对准的方向是可行的。关键词:数字照片分析;环形人工晶状体;偏差;角膜散光

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Detection of Toric intraocular lens misalignment by digital photograph

Background Toric intraocular lens (Toric IOL) is a well accepted method of correct of corneal astigmatism.Axial misalignment,including the error of intraocular lens alignment during surgery and rotation of Toric IOL,is the main barrier to the precise alignment of Toric intraocular lenses.Therefore,the angle of axial misalignment is a main index to evaluate the effectiveness of Toric IOL implantation.Objective The present study is to describe a method of precisely detecting Toric IOL misalignment using postoperative digital photograph.Methods A measuring template (polar coordinates) was constructed using Adobe Photoshop software.Minimum graduate to detect the Toric axis was 1° (maximum error 0.5°).The clinical data of 24 eyes undergone Toric IOL implantation was retrospectively analyzed.Corneal astigmatism was detected by rotating Scheimpflug camera (Pentacam) or slit scan (Orbscan).Digital retro illumination picture was photographed after mydriasis.The picture was analyzed by our derived template.The steepest corneal axis and the axis of Toric IOL were then determined.The misalignment of Toric IOL was determined as the angle between the steepest corneal axis and the axis of Toric IOL.Misalignment of Toric IOL and its distribution were analyzed by statistical means.Results A method using polar coordinates and digital photo to precisely detect Toric IOL misalignment was derived.Mean Toric IOL misalignment was 10.93±6.90 degrees (0-24 degrees) in the 24 cases.The axial misalignment in all of cases were within 25 degrees,including clockwise in 14 eyes(58.33%),anticlockwise in 10 eyes (41.67%).In this study,the misalignment angle of 4 eyes were within 5 degrees;11 eyes were 5 to 10 degrees;1 eye was 10 to 15 degrees;6 eyes were 15 to 20 degrees;2 eyes were 20 to 25 degrees.Conclusion The method is feasible to the direction of Toric IOL misalignment in clinic. Key words: digital photograph analysis; Toric intraocular lens; misalignment; corneal astigmatism

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Chinese Ophthalmic Research

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