Medmont自动视野计与Humphrey视野分析仪的整体指标比较。
A comparison of global indices between the Medmont Automated Perimeter and the Humphrey Field Analyzer.
作者信息
Landers John, Sharma Alok, Goldberg Ivan, Graham Stuart
机构信息
Eye Associates, Park House, Sydney, Australia.
出版信息
Br J Ophthalmol. 2007 Oct;91(10):1285-7. doi: 10.1136/bjo.2007.114926. Epub 2007 Mar 27.
BACKGROUND
Two commonly used perimeters in Australia are the Humphrey Field Analyzer II (HFA) and the Medmont Automated Perimeter (MAP). Each device describes the visual field in terms of numerical values called global indices; however, these values are not interchangeable between devices. This study was designed to directly compare the global indices of HFA and MAP visual fields.
METHODS
63 subjects who had suspected glaucoma, ocular hypertension or glaucoma, or were normal controls were recruited selectively. Each patient was tested with the MAP and HFA. Global indices were then compared between tests. These included mean deviation (MD) and pattern standard deviation (PSD) from the HFA and average defect (AD) and pattern defect (PD) from the MAP.
RESULTS
The MD and PSD results were strongly correlated with the AD and PD results, respectively. The relationship between them could be described in terms of two polynomial equations: AD = 0.94+1.31(MD)+0.02(MD)(2) and PD = 2.21(PSD)-0.05(PSD)(2)-0.006. These non-linear relationships may be the result of differences in testing method (test stimulus spectrum, number of testing locations or background luminance) or differences in the way each global index was calculated.
CONCLUSION
The AD and PD results obtained from the MAP may be substituted for the MD and PSD results from the HFA after appropriate conversion.
背景
澳大利亚常用的两种视野计是 Humphrey 视野分析仪 II（HFA）和 Medmont 自动视野计（MAP）。每种设备都用称为全局指数的数值来描述视野；然而，这些数值在不同设备之间不可互换。本研究旨在直接比较 HFA 和 MAP 视野的全局指数。
方法
选择性招募了 63 名疑似青光眼、高眼压症或青光眼患者或正常对照者。每位患者都接受了 MAP 和 HFA 测试。然后比较测试之间的全局指数。这些包括 HFA 的平均偏差（MD）和模式标准偏差（PSD）以及 MAP 的平均缺损（AD）和模式缺损（PD）。
结果
MD 和 PSD 结果分别与 AD 和 PD 结果高度相关。它们之间的关系可以用两个多项式方程来描述：AD = 0.94 + 1.31(MD) + 0.02(MD)(2) 和 PD = 2.21(PSD) - 0.05(PSD)(2) - 0.006。这些非线性关系可能是测试方法（测试刺激光谱、测试位置数量或背景亮度）的差异或每个全局指数计算方式的差异导致的。
结论
经过适当转换后，从 MAP 获得的 AD 和 PD 结果可以替代 HFA 的 MD 和 PSD 结果。
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