Abstract
Purpose
This study aimed to investigate the effect of blue-light blocking ophthalmic lenses on legibility and fatigue during near work with a smartpad.
Methods
Twenty-two subjects, who had a binocular vision of 0.8 or greater and no ocular disease, were asked to use a smartpad for 10 minutes after overlaying two kinds of blue-light blocking lenses(BRC and BB lens) and a plano lens on a trial lens frame. Before and after reading, non-invasive tear break up time(NIBUT) and their fatigue were respectively measured, and the clinical effect of blue-light blocking lenses were analyzed by estimating reading speed and recovery time of tear film after reading.
Results
Under the dark light, relatively lower NIBUT was shown in the case of blue-light blocking lenses compared to it with a plano lens during a display work with a smartpad. As a result of recovery time of tear film after reading, the rate showed a tendency to be faster in the order of the BB > plano > BRC lens under the bright condition however, the rate was shown to be faster in the order of the BRC > plano > BB lens under the dark condition. In the subjective symptoms questionnaire, general symptoms showed a tendency to be higher with wearing the blue-light blocking lenses than plano lens however, ocular symptoms were lower under bright illumination when using a BRC lens.
Conclusions
From the results of this study, blue-light blocking lenses show the effect on the recovery rate of tear film and the reduction of subjective ocular symptoms after a display work; however, the degree varies depending on the illumination conditions. Therefore, it is suggested to select an appropriate blue-light blocking lens according to the working conditions in order to reduce the eye fatigue during the display work.
This study aimed to investigate the effect of blue-light blocking ophthalmic lenses on legibility and fatigue during near work with a smartpad.
Methods
Twenty-two subjects, who had a binocular vision of 0.8 or greater and no ocular disease, were asked to use a smartpad for 10 minutes after overlaying two kinds of blue-light blocking lenses(BRC and BB lens) and a plano lens on a trial lens frame. Before and after reading, non-invasive tear break up time(NIBUT) and their fatigue were respectively measured, and the clinical effect of blue-light blocking lenses were analyzed by estimating reading speed and recovery time of tear film after reading.
Results
Under the dark light, relatively lower NIBUT was shown in the case of blue-light blocking lenses compared to it with a plano lens during a display work with a smartpad. As a result of recovery time of tear film after reading, the rate showed a tendency to be faster in the order of the BB > plano > BRC lens under the bright condition however, the rate was shown to be faster in the order of the BRC > plano > BB lens under the dark condition. In the subjective symptoms questionnaire, general symptoms showed a tendency to be higher with wearing the blue-light blocking lenses than plano lens however, ocular symptoms were lower under bright illumination when using a BRC lens.
Conclusions
From the results of this study, blue-light blocking lenses show the effect on the recovery rate of tear film and the reduction of subjective ocular symptoms after a display work; however, the degree varies depending on the illumination conditions. Therefore, it is suggested to select an appropriate blue-light blocking lens according to the working conditions in order to reduce the eye fatigue during the display work.
| Translated title of the contribution | The Effect of Blue-light Blocking Ophthalmic Lenses on Legibility and Fatigue during Near work with a Smartpad |
|---|---|
| Original language | Korean |
| Pages (from-to) | 81-88 |
| Number of pages | 8 |
| Journal | 한국안광학회지 |
| Volume | 22 |
| Issue number | 1 |
| DOIs | |
| State | Published - Mar 2017 |