Miller R J
Am J Optom Physiol Opt. 1978 Jul;55(7):447-50. doi: 10.1097/00006324-197807000-00001.
The temporal stability of the dark focus of accommodation (the refractive power of the eye in total darkness) was examined using a laser optometer. It was found that dark focus does not vary greatly in most subjects over a period of 2--3 weeks. Intrasubject ranges varied from 0.08--2.92 over that period, with a mean range of 1.07 D. Theoretical and practical implications of these findings are discussed.
使用激光验光仪检查了调节暗焦点（眼睛在完全黑暗中的屈光力）的时间稳定性。研究发现，在2至3周的时间内，大多数受试者的暗焦点变化不大。在此期间，受试者内部的范围在0.08至2.92之间变化，平均范围为1.07屈光度。讨论了这些发现的理论和实际意义。
