School of Optometry and Vision Science, University of New South Wales, Kensington, Sydney, New South Wales, Australia.
Optom Vis Sci. 2020 Nov;97(11):995-1004. doi: 10.1097/OPX.0000000000001601.
The selective reduction in visible wavelengths transmitted through commercially available blue-blocking lenses (BBLs) is known to influence the appearance and contrast detection of objects, particularly at low light levels. This influence may impair the human retinal receptor response time to dynamic light changes during photostress events.
This study aimed to assess whether BBLs selectively affect photostress recovery times (PSRTs) for chromatic and achromatic stimuli of different Weber contrasts that were viewed on a dark black background.
Photostress recovery times were measured in 12 younger participants (18 to 39 years old) with no history of ocular disease or abnormal vision. Photostress recovery times were evaluated for four brands of BBLs, which were compared with a control lens. In these experiments, after exposure to an intense light source for 5 seconds, the time taken to recover vision and correctly identify a computer-generated letter stimulus viewed under low and high luminance levels was determined, which means perception is likely to be governed by mesopic and photopic conditions. Across conditions, the letter stimulus was achromatic and chromatic and could differ in luminance contrast.
Under photopic stimulus conditions, although reducing luminance contrast increased PSRTs, BBLs had no significant effect on PSRTs relative to control lens. However, under mesopic stimulus conditions, BBLs significantly affect PSRTs for both achromatic (F2.006,8.02 = 61.95, P < .0001) and chromatic stimuli (F3,16 =139.01, P < .0001), particularly for blue targets, which had considerably longer PSRTs (38.40 seconds). The brand of BBL was also shown to selectively affect PSRTs, with those with transmittance profiles that block the most blue light having longer PSRTs.
The present study suggests that, although the color and contrast of the target stimuli affected recovery times, the difference in recovery times between different types of BBLs was noticed only under low-light-level stimulus conditions.
商业上可用的蓝阻滤光镜（BBL）选择性地减少可见光的传输，已知会影响物体的外观和对比度检测，特别是在低光照水平下。这种影响可能会损害人眼视网膜受体对光压力事件期间动态光变化的反应时间。
本研究旨在评估 BBL 是否会选择性地影响在黑暗背景下观察到的不同韦伯对比度的色觉和非色觉刺激的光压力恢复时间（PSRT）。
对 12 名年龄在 18 至 39 岁之间、无眼部疾病或视力异常史的年轻参与者进行光压力恢复时间测量。使用四个品牌的 BBL 评估光压力恢复时间，并与对照镜片进行比较。在这些实验中，在暴露于强烈光源 5 秒后，确定在低和高照度水平下恢复视力并正确识别计算机生成的字母刺激所需的时间，这意味着感知可能由中间视觉和明视觉条件控制。在所有条件下，字母刺激都是非色觉和色觉的，可以在亮度对比度上有所不同。
在明视觉刺激条件下，尽管降低亮度对比度会增加 PSRT，但与对照镜片相比，BBL 对 PSRT 没有显著影响。然而，在中间视觉刺激条件下，BBL 对色觉（F2.006,8.02 = 61.95，P <.0001）和非色觉刺激（F3,16 = 139.01，P <.0001）的 PSRT 都有显著影响，特别是对蓝色目标，其 PSRT 明显更长（38.40 秒）。研究还表明，BBL 的品牌选择性地影响 PSRT，那些透光率曲线能最大程度地阻挡蓝光的 BBL 具有更长的 PSRT。
本研究表明，尽管目标刺激的颜色和对比度会影响恢复时间，但只有在低光照水平刺激条件下，不同类型的 BBL 之间的恢复时间差异才会被注意到。
