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首页> 外文期刊>Ophthalmology >Axial length measurements by contact and immersion techniques in pediatric eyes with cataract.
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Axial length measurements by contact and immersion techniques in pediatric eyes with cataract.

机译：通过接触和浸没技术在小儿白内障眼中测量轴长。

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PURPOSE: To compare axial length measurements by contact and immersion techniques in pediatric cataractous eyes. DESIGN: Prospective, comparative case series. PARTICIPANTS: In this prospective study, 50 cataractous eyes of 50 children were enrolled. In bilateral cataract, only 1 eye was selected to avoid a correlation effect in statistical analyses. METHODS: Axial length was measured by both contact and immersion techniques for all eyes, randomized as to which to perform first to avoid measurement bias. MAIN OUTCOME MEASURES: Axial length measured by contact and immersion techniques and the difference between contact and immersion technique axial length measurements. RESULTS: Mean age+/-standard deviation at cataract surgery and at axial length measurement was 3.87+/-3.72 years. Axial length measurement by contact technique was significantly shorter as compared with immersion technique (21.36+/-3.04 mm and 21.63+/-3.09 mm, respectively; P<0.001). Axial length measurements using the contact technique were on an average 0.27 mm shorter than those obtained using the immersion technique. Forty-two eyes (84%) had shorter axial length when measured using the contact technique as compared with the immersion technique. Lens thickness measurement by contact technique was not significantly different from that of immersion technique (3.61+/-0.74 and 3.60+/-0.67 mm, respectively; P = 0.673). Anterior chamber depth measurement was significantly more shallow with the contact technique (3.39+/-0.59 mm and 3.69+/-0.54 mm, respectively; P<0.001). Intraocular lens power needed for emmetropia was significantly different (28.68 diopters [D] vs. 27.63 D; P<0.001). CONCLUSIONS: Contact A-scan measurements yielded shorter axial length than immersion A-scan measurements. This difference was mainly the result of the anterior chamber depth rather than the lens thickness value. During intraocular lens (IOL) power calculation, if axial length measured by contact technique is used, it will result in the use of an average 1-D stronger IOL power than is actually required. This can lead to induced myopia in the postoperative refraction.
机译：目的：比较在儿童白内障眼中通过接触和浸入技术进行的轴向长度测量。设计：前瞻性比较案例系列。参与者：在这项前瞻性研究中，纳入了50名儿童的50只白内障眼。在双侧白内障中，仅选择一只眼睛以避免统计分析中的相关影响。方法：通过接触和浸没技术对所有眼睛进行轴长测量，随机选择首先执行的眼以避免测量偏差。主要观察指标：通过接触和浸入技术测量的轴向长度以及接触和浸入技术的轴向长度测量之间的差异。结果：白内障手术和轴向长度测量的平均年龄+/-标准偏差为3.87 +/- 3.72岁。与浸入法相比，通过接触法测得的轴长显着缩短（分别为21.36 +/- 3.04 mm和21.63 +/- 3.09 mm; P <0.001）。使用接触技术测得的轴向长度平均比使用浸入技术测得的平均长度短0.27 mm。与浸入技术相比，使用接触技术测量的四十二只眼（84％）的眼轴长度较短。通过接触技术测得的镜片厚度与浸入法测得的厚度没有显着差异（分别为3.61 +/- 0.74和3.60 +/- 0.67 mm; P = 0.673）。接触技术前房深度测量明显更浅（分别为3.39 +/- 0.59 mm和3.69 +/- 0.54 mm; P <0.001）。正视所需的人工晶状体屈光度显着不同（28.68屈光度[D]对27.63 D; P <0.001）。结论：接触式A扫描测量的轴向长度比浸入式A扫描测量的轴向长度短。这种差异主要是前房深度而不是晶状体厚度值的结果。在人工晶状体（IOL）屈光度计算过程中，如果使用通过接触技术测量的轴向长度，则将导致使用比实际需要的平均1D强的IOL屈光度。这会导致术后屈光引起近视。

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