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首页> 外文期刊>The British and Irish orthoptic journal. >Convergence accommodation to convergence (CA/C) ratio: stability with different levels of convergence demand
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Convergence accommodation to convergence (CA/C) ratio: stability with different levels of convergence demand

机译：收敛适应与收敛（CA / C）比率：不同级别的收敛需求下的稳定性

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Aim: To measure the convergence accommodation to convergence (CA/C) ratio over a range of levels of convergence demand.Methods: Convergence accommodation was measured in 26 subjects with normal binocular single vision. The CA/C ratio was calculated by measuring the accommodative changes induced with base-out prisms of 5~DELTA to 20~DELTA in 5~DELTA steps whilst the participant maintained binocular fixation on a pseudo-Gaussian target at 40 cm. Accommodative change was measured using the open-field view Shin-Nippon SRW-5000 autorefractometer [Grand Seiko Company, Fukuyama, Japan].Results: The mean age of the participants was 20 +- 2.5 years (range 18-29 years). The mean (+- SD) CA/C ratio for the 5~DELTA, 10~DELTA, 15~DELTA and 20~DELTA prisms was 0.13 (+-0.07) D/PD, 0.12 (+-0.05) D/PD, 0.13 (+-0.05) D/PD and 0.13 (+-0.05) D/PD, respectively. The overall mean (+-SD) CA/C ratio was 0.13 (+-0.04) D/PD (range 0.04-0.20 D/PD). One-factor repeated measures ANOVA found that the CA/C ratio did not change significantly with an increase in convergence (F = 0.202, d.f. = 3, 69, p = 0.8947).Conclusion: The CA/C ratio did not change significantly with increasing induced vergence. The data suggest that some degree of non-linearity/variation should be expected in the normal, healthy population of the same age group.
机译：目的：在一定程度的会聚需求水平上测量会聚适应与会聚（CA / C）的方法。方法：对26名双眼单视正常的受试者进行会聚适应性的测量。 CA / C比是通过在5 DELTA步中测量5 DELTA到20 DEL的底向外棱镜引起的调节变化来计算的，而参与者将双目镜固定在40 cm的准高斯目标上。使用开阔视野的Shin-Nippon SRW-5000自动折光仪[日本大山精工公司，日本福山]测量适应性变化。结果：参加者的平均年龄为20±2.5岁（18-29岁）。 5个，10个，15个和20个棱镜的平均（±SD）CA / C比为0.13（+ -0.07）D / PD，0.12（+ -0.05）D / PD， 0.13（+ -0.05）D / PD和0.13（+ -0.05）D / PD。总平均（+ -SD）CA / C比为0.13（+ -0.04）D / PD（范围为0.04-0.20 D / PD）。一因素重复测量方差分析（ANOVA）发现，随着收敛度的增加，CA / C比没有显着变化（F = 0.202，df = 3，69，p = 0.8947）。增加诱导的聚散度。数据表明，在同一年龄段的正常健康人群中，应预期某种程度的非线性/变异。

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