AIM:To measure the contrast sensitivity(CS)using computer-based Chart2020 software pre-and post-white light exposure with and without blue-blocking lenses(BBLs).METHODS:The study included participants aged 18 to 25y(n...AIM:To measure the contrast sensitivity(CS)using computer-based Chart2020 software pre-and post-white light exposure with and without blue-blocking lenses(BBLs).METHODS:The study included participants aged 18 to 25y(n=30 eyes),where baseline CS was measured before the experiment.Following this,the participants were exposed to two white light-emitting diodes(LEDs;450 lx each),placed at a 45-degree angle from the participant’s eye and 80 cm from the light source.All participants were randomly divided into three groups(BBL1-Placebo lens,BBL2-Crizal Prevencia,BBL3-Duravision)by sequential randomisation,which was double-blinded.Post-light exposure,the CS was measured monocularly with a calibrated computer-based CS Chart-2020 software at different log units.RESULTS:CS measured using Chart-2020 software at 0.8,1.5,6,12,and 18 cpd pre-and post-white LED exposure with and without BBLs showed a significant difference(P<0.05)in contrast threshold and log contrast at 6 cpd and 18 cpd(P<0.05)and showed no significant differences in 0.8,1.5,12 cpd(P>0.05).CONCLUSION:This study shows that exposure to white LEDs can diminish CS,while BBLs may ameliorate these negative effects.展开更多
文摘AIM:To measure the contrast sensitivity(CS)using computer-based Chart2020 software pre-and post-white light exposure with and without blue-blocking lenses(BBLs).METHODS:The study included participants aged 18 to 25y(n=30 eyes),where baseline CS was measured before the experiment.Following this,the participants were exposed to two white light-emitting diodes(LEDs;450 lx each),placed at a 45-degree angle from the participant’s eye and 80 cm from the light source.All participants were randomly divided into three groups(BBL1-Placebo lens,BBL2-Crizal Prevencia,BBL3-Duravision)by sequential randomisation,which was double-blinded.Post-light exposure,the CS was measured monocularly with a calibrated computer-based CS Chart-2020 software at different log units.RESULTS:CS measured using Chart-2020 software at 0.8,1.5,6,12,and 18 cpd pre-and post-white LED exposure with and without BBLs showed a significant difference(P<0.05)in contrast threshold and log contrast at 6 cpd and 18 cpd(P<0.05)and showed no significant differences in 0.8,1.5,12 cpd(P>0.05).CONCLUSION:This study shows that exposure to white LEDs can diminish CS,while BBLs may ameliorate these negative effects.
