Post R B, Johnson C A, Owens D A
Am J Optom Physiol Opt. 1985 Aug;62(8):533-7. doi: 10.1097/00006324-198508000-00006.
Measurements of the resting focus of accommodation were obtained with an infrared optometer while subjects engaged in four tasks: (1) passive viewing in darkness; (2) passive viewing of a laser speckle pattern; (3) active judgment of motion in a laser speckle pattern; and (4) mental arithmetic in darkness. The results showed resting focus measures to be comparable under all four conditions for some subjects. However, other subjects exhibited consistent increases or decreases in the resting focus position when asked to judge the direction of speckles within the laser test pattern or perform mental arithmetic. This finding suggests that "effort to see" may influence the resting focus of some subjects. Implications for measurement procedures and population estimates of the resting focus are discussed.
在受试者进行四项任务时，使用红外验光仪测量了静息调节焦点：（1）在黑暗中被动观看；（2）被动观看激光散斑图案；（3）主动判断激光散斑图案中的运动；（4）在黑暗中进行心算。结果显示，对于一些受试者，在所有四种条件下静息焦点测量结果具有可比性。然而，当要求其他受试者判断激光测试图案中散斑的方向或进行心算时，他们的静息焦点位置出现了持续的增加或减少。这一发现表明，“观看努力”可能会影响一些受试者的静息焦点。文中讨论了对静息焦点测量程序和总体估计的影响。
