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목적 : To investigate the effect of reading or writing on a smartphone in terms of intraocular pressure (IOP) changes.
방법 : Thirty-nine (39) healthy young (age < 40) volunteers were requested to conduct standardized work (i.e., read a sample text on single mobile device and subsequently type it on the same device) under daylight [300 lux] and low-light [100 lux] conditions independently on consecutive days. On each day, three sets of IOP measurements (total: 7) using a rebound tonometer (iCare PRO; Tiolat, Helsinki, Finland) were performed: (1) pre-work (baseline) [2 measurements], (2) during smartphone work [5, 15, and 25 minutes], and (3) post-work [5 and 15 minutes].
결과 : Under the daylight condition, the baseline IOP was 13.7±1.8 mmHg, and the IOP increased after 5 minutes of work (14.1±1.8 mmHg; P<0.001). When the work lasted for 15 minutes, the IOP increased further (15.5±1.7 mmHg; P<0.001). After stopping the work for 5 minutes, IOP was restored (13.9±1.7 mmHg). In the low-light condition, the IOP was significantly increased after 5 minutes (from 13.9±1.9 to 15.6±1.8 mmHg; P<0.001) and 25 minutes of smartphone work (17.0±1.7 mmHg; P<0.001). 5 minutes after stopping the work, IOP dropped even lower than the pre-work level (12.8±1.9 mmHg; P<0.001).
결론 : In healthy young subjects, reading or writing on smartphone significantly increased IOP, and the changes of IOP were faster and greater under the low-light condition. Smartphone users who are concerned about IOP fluctuation are advised to (1) take a break if they read or write on smartphone for more than 5 minutes, and (2) avoid using smartphones wherever possible in dark places.
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