Kono R, Hasebe S, Ohtsuki H, Furuse T, Tanaka T
Department of Ophthalmology, Okayama University Medical School, Japan.
Jpn J Ophthalmol. 1998 Sep-Oct;42(5):363-7. doi: 10.1016/s0021-5155(98)00034-3.
We evaluated the characteristics of phoria adaptation for vertically induced retinal disparity. An adaptive change in the fusion-free ocular alignment, phoria adaptation, was measured with a computer-aided mirror haploscope at 10, 30, and 60 minutes after the start of wearing of a 3-prism-diopter base up prism by 35 normal subjects ranging in age from 21 to 67 years (mean: 37 years). The relationships between phoria adaptation and the subjects' age, the vertical fusional amplitude, the amount of heterophoria, and the starting time of the examination were evaluated. All subjects showed phoria adaptation, with the mean (+/- SD) degree of 0.78 +/- 0.28 degree, 0.96 +/- 0.26 degree and 1.02 +/- 0.30 degrees at 10, 30, and 60 minutes, respectively, after wearing the prism. The repeatability (95% confidence interval) for the measurements was less than +/- 0.24 degree. There was a significant correlation between the vertical fusional amplitude and the gain of phoria adaptation (at 10 and 60 minutes, P < 0.05). The gain of phoria adaptation measured at 60 minutes showed a significant decrease with age (P < 0.01). The results indicate that the time course of phoria adaptation in the vertical direction is similar to that in the horizontal direction and its gain differs considerably among subjects.
我们评估了垂直诱导性视网膜视差的隐斜适应特征。通过计算机辅助的镜面式双眼单视仪，对35名年龄在21至67岁（平均37岁）的正常受试者佩戴3棱镜度底朝上棱镜开始后10分钟、30分钟和60分钟时的无融合眼位适应性变化（隐斜适应）进行了测量。评估了隐斜适应与受试者年龄、垂直融合幅度、隐斜量以及检查开始时间之间的关系。所有受试者均表现出隐斜适应，佩戴棱镜后10分钟、30分钟和60分钟时的平均（±标准差）度数分别为0.78±0.28度、0.96±0.26度和1.02±0.30度。测量的重复性（95%置信区间）小于±0.24度。垂直融合幅度与隐斜适应增益之间存在显著相关性（在10分钟和60分钟时，P<0.05）。60分钟时测量的隐斜适应增益随年龄显著降低（P<0.01）。结果表明，垂直方向隐斜适应的时间进程与水平方向相似，但其增益在受试者之间存在很大差异。
