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首页> 外文期刊>American Orthoptic Journal >The Gradient AC/A Ratio:What's Really Normal?
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The Gradient AC/A Ratio:What's Really Normal?

机译：渐变AC / A比率：什么是真正的正常现象？

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摘要

The two most commonly used methods for determining the AC/A ratio are the Gradient Method and the Clinical Method. Though both methods are simple, practical, and often used interchangeably, they are really quite different. The Gradient AC/A measures the amount of convergence generated by a diopter of accommodative effort, while the Clinical Method detects the presence of a distance-near disparity of 10 or more prism diopters of esotropia. The purpose of this prospective study was to compare the Gradient and Clinical AC/A in 69 consecutive patients presenting with acquired nonparalytic esotropia. In addition, two methods of calculating the Gradient AC/A were compared: "minus" AC/A in which accommodation (and therefore accommodative convergence) is stimulated, and "plus" AC/A in which accommodation (and accommodative convergence) is relaxed. Mean Gradient AC/A for patients with a normal Clinical AC/A was 2:1, below the range traditionally thought of as normal. Mean Gradient AC/A for patients with a high Clinical AC/A was 5:1. Forty-four percent of those with a high Clinical AC/A had a normal or low Gradient AC/A, suggestive of nonaccommodative convergence excess. Mean Gradient AC/A with plus lenses was statistically identical to the AC/A with the minus lens method.
机译：确定AC / A比的两种最常用方法是“梯度法”和“临床法”。尽管这两种方法都很简单，实用，并且经常可以互换使用，但是它们的确有很大的不同。渐变AC / A测量由适应力屈光度产生的会聚量，而“临床方法”检测到存在10个或更多的内斜视棱镜屈光度的近距离视差。这项前瞻性研究的目的是比较69例连续获得性非麻痹性内斜视患者的梯度和临床AC / A。此外，还比较了两种计算梯度AC / A的方法：刺激了适应性（因此适应性收敛）的“负” AC / A，以及放松了适应性（以及适应性收敛）的“ +” AC / A。 。临床AC / A正常患者的平均梯度AC / A为2：1，低于传统上认为正常的范围。临床AC / A高的患者的平均梯度AC / A为5：1。临床AC / A高的患者中有44％的AC / A正常或较低，提示非适应性收敛过度。带有正透镜的平均梯度AC / A与负透镜法的AC / A在统计学上相同。

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