Gray L S, Strang N C, Winfield N, Gilmartin B, Winn B
Department of Vision Sciences, Glasgow Caledonian University, Scotland.
Optom Vis Sci. 1998 Dec;75(12):897-902. doi: 10.1097/00006324-199812000-00012.
The present study examines the magnitude, distribution, and relationship of open-loop accommodation obtained using the three most common methods of opening the accommodation loop.
Open-loop accommodation was measured in 93 young, emmetropic subjects using a Canon R1 objective infrared optometer, and the accommodation loop was opened using the following methods: (1) dark empty field (DA), (2) bright empty field (BA), and (3) viewing a target through a small artificial pupil (PA).
PA was found to elicit significantly (p = 0.0001) higher values of open-loop accommodation than either DA or BA and demonstrated a much wider distribution of values than DA or BA. A further experiment demonstrated that the higher PA was attributable to the proximal effect of placing a small artificial pupil close to the eye.
Our results suggest that using a small artificial pupil to open the accommodation loop may not produce a veridical measure of open-loop accommodation.
本研究探讨了使用三种最常见的打开调节环方法所获得的开环调节的幅度、分布及关系。
使用佳能R1客观红外验光仪对93名年轻正视眼受试者进行开环调节测量，并采用以下方法打开调节环：（1）暗视空白视野（DA），（2）明视空白视野（BA），以及（3）通过小人工瞳孔观察目标（PA）。
发现PA所引发的开环调节值显著高于DA或BA（p = 0.0001），并且其值的分布比DA或BA更广泛。进一步的实验表明，较高的PA值归因于将小人工瞳孔靠近眼睛放置的近端效应。
我们的结果表明，使用小人工瞳孔打开调节环可能无法产生开环调节的真实测量值。
