Wong L C, Rosenfield M, Wong N N
State University of New York, State College of Optometry, New York, New York 10036, USA.
Binocul Vis Strabismus Q. 2001;16(1):29-34.
Vergence adaptation has not been well investigated in children even though it may contribute to binocular dysfunction and near work induced asthenopia.
We compared vergence adaptation in 18 children and 18 young adult subjects by assessing tonic vergence (TV) before and immediately after a period of sustained near fixation, by measuring heterophoria with a synoptophore through 0.5 mm binocular pinholes. Adaptation was induced by a reading task at 15 cm for a continuous 5 minute period.
Mean pre-task TV values of 0.70 MA (Meter Angles) and 0.20 MA were observed for the children and young adults, respectively (p = 0.08). The initial mean vergence adaptation for children and adults was +0.45 MA and +0.11 MA, respectively (p = 0.001).
The greater vergence adaptation observed in children may impact upon the clinical assessment of their binocular vision, especially heterophoria measurement which may require longer periods of dissociation than previously recommended, and might also ultimately be partly responsible for the predominant development of esodeviations during childhood
尽管聚散适应可能导致双眼功能障碍和近距工作引起的视疲劳，但在儿童中尚未得到充分研究。
我们通过评估持续近距注视前后的静息聚散（TV），并使用同视机通过0.5毫米双眼针孔测量隐斜，比较了18名儿童和18名年轻成人的聚散适应情况。通过在15厘米处进行连续5分钟的阅读任务诱导适应。
儿童和年轻成人任务前的平均TV值分别为0.70米角（MA）和0.20米角（p = 0.08）。儿童和成人的初始平均聚散适应分别为+0.45米角和+0.11米角（p = 0.001）。
在儿童中观察到的更大的聚散适应可能会影响其双眼视觉的临床评估，特别是隐斜测量，这可能需要比先前建议的更长的分离时间，并且最终也可能部分导致儿童期外斜视的主要发展。
