Sheedy J E, Saladin J J
Am J Optom Physiol Opt. 1975 Jul;52(7):474-81. doi: 10.1097/00006324-197507000-00005.
The exophoria at near working distances through a plus lens addition which exists in presbyopia was investigated in order to explain the paradoxical lack of asthenopic symptoms associated with this condition. Fixation disparity measurements indicate that the exophoria which is measured by the von Graefe technique does not exist under binocular conditions. Further analysis indicates that presbyopes may have unrestrained use of accommodative convergence.
为了解释老花眼中通过增加正透镜在近工作距离处存在的外隐斜却缺乏与之相关的视疲劳症状这一矛盾现象，对其进行了研究。注视差异测量表明，用von Graefe技术测量出的外隐斜在双眼条件下并不存在。进一步分析表明，老花眼患者可能无节制地使用调节性集合。
