스마트 기기로 바탕색이 다른 근거리작업 시 청광차단렌즈가 가독성 및 자각 증상에 미치는 영향

Purpose: In this study, the effect of blue light blocking lenses on changes in legibility and subjective symptoms during near work with white and blue backgrounds having different ratios of blue light was investigated when the study subjects were wearing lenses with different blocking ranges and rates against blue light. Methods: Thirty subjects were chosen for inclusion in the study, and their refractive error was fully corrected using a trial frame. The subjects were asked to read the letters on a smart device with white and blue backgrounds for 10 minutes after overlaying a regular lens and two types of blue light-blocking lenses on the trial frame, respectively. Reading speed, total pages read, and subjective symptoms were measured, and the lens preferences were analyzed. Results: There was no significant difference in legibility between the background colors and lens types; however, the number of subjects showing improved legibility increased when the blue background was used compared with the white background by blocking the blue light. There was some exacerbation of general and ocular symptoms during work on the white background having a low ratio of blue light due to wear of blue light-blocking lens; however, no preference regarding the lenses was reported. When wearing a blue light-blocking lens, ocular symptoms did not change during work on the blue background with a high ratio of blue light, and more than half of the participants preferred to wear the blue light-blocking lens. The preference for blue lightblocking lens was not correlated with the blue light-blocking rate. Conclusions: The results revealed that wearing a blue light-blocking lens might not exacerbate the subjective symptoms under conditions with a high ratio of blue light on the display. However, lens preference could vary according to the range of blue light blocked and blocking rate.