目的：分析普通用户使用电子设备/电脑的工作距离(WD)及移动电话使用距离(MPUD)的特征。

方法：横向描述性研究。经过筛选后，纳入每天使用电子设备/电脑超过2h的专业人员100例，年龄20-62(平均41.2)岁，测量每位受试者工作环境中使用电子设备/电脑的工作距离(WD)、手臂长度和MPUD。

结果：纳入受检者WD明显长于MPUD(61.22±12.35 vs 32.22±6.35 cm； P<0.001)，MPUD明显短于臂长(74.44±4.65 cm； P<0.001)。4%和91%的受检者WD和MPUD分别小于或等于40 cm。WD与MPUD、手臂长度均呈弱相关性(r=0.387，P<0.001； r=0.260，P<0.001)。不同职业受试者WD有显著差异(P=0.021)，军队人员相比大学研究人员和讲师的WD更长(P=0.025)。

结论：普通用户使用电子设备/电脑的工作距离与移动电话使用距离差别较大，移动电话使用距离较近，这对于矫正老视具有一定的参考意义。

METHODS: Transversal descriptive study consisting of a screening campaign evaluating the visual status of different professionals working with computers or electronic devices more than 2h per day. A total of 100 healthy patients with a mean age of 41.2(range: 20-62)years were revised and subdivided according to job subgroups. A battery of screening tests was performed to all participants in a single session at the working environment of each of them, including measurement of the working distance(WD), arm length, and MPUD.

RESULTS:The WD was significantly longer than MPUD(61.22±12.35 vs 32.22±6.35 cm; P<0.001). Likewise, MPUD was significantly shorter than the arm length(74.44±4.65 cm; P<0.001). A total of 4%(4/100)and 91%(91/100)of patients had a WD and MPUD of 40 cm or below, respectively. A weak although statistically significant correlation was found between WD and MPUD(r=0.387, P<0.001)as well as between WD and arm length(r=0.260, P=0.009). Statistically significant differences were detected among job subgroups in WD(P=0.021), being longer for militaries compared to university researchers and lecturers(P=0.025).

CONCLUSION:Working and mobile phone usage distances vary significantly among common users of computers and digital devices, although the use of mobile phones tends to be performed at significantly closer distances. This parameter should be considered when planning any type of optical correction, especially for presbyopia.