Pellizzer S, Siderov J
Clinic Research Unit, Victorian College of Optometry, Carlton, Australia.
Optom Vis Sci. 1998 Nov;75(11):817-21. doi: 10.1097/00006324-199811000-00023.
The aim of this study was to establish whether assessment of vergence facility is clinically useful in older adults with presbyopia and to determine pilot normative data for this age range.
Vergence facility was measured in a sample of 50 asymptomatic subjects with a mean age of 58.7 years using 8delta base-in (BI) and 12delta base-out (BO) prisms mounted in clinical flipper frames. Testing was performed for 1 min on four separate occasions over the course of a few weeks.
Of the 42 subjects that completed the study, vergence facility could be satisfactorily measured on only 21 subjects. The mean vergence facility for this group was approximately 7 cycles per minute (cpm), commensurate with previous results in younger subjects using a similar paradigm. There were no differences in vergence facility between the first and second 30-s periods of testing, nor were there any differences in average vergence facility over the 4 test occasions. Test-retest repeatability, however, was poor. The BI prism phase took longer, on average, to fuse than the BO prism phase (BI 5.2 s and BO 3.7 s).
Our results show a high degree of variability in vergence facility in older subjects with presbyopia. More research is required before deciding whether measurements of vergence facility are of use in investigating binocular vision of older patients with presbyopia.
本研究旨在确定对老花眼老年人进行聚散功能评估在临床上是否有用，并确定该年龄范围的初步规范数据。
使用安装在临床翻转镜架上的8棱镜底向内（BI）和12棱镜底向外（BO）棱镜，对50名平均年龄为58.7岁的无症状受试者进行聚散功能测量。在几周内分四次进行测试，每次测试1分钟。
在完成研究的42名受试者中，仅21名受试者的聚散功能能够得到满意测量。该组的平均聚散功能约为每分钟7个周期（cpm），与之前使用类似范式对年轻受试者的研究结果相当。测试的前30秒和后30秒期间的聚散功能没有差异，在4次测试中的平均聚散功能也没有差异。然而，重测重复性较差。平均而言，BI棱镜融合阶段比BO棱镜融合阶段花费的时间更长（BI为5.2秒，BO为3.7秒）。
我们的结果显示，老花眼老年受试者的聚散功能存在高度变异性。在确定聚散功能测量是否有助于研究老花眼老年患者的双眼视觉之前，还需要更多的研究。
