da Costa Marcelo Fernandes, Júnior Augusto Paranhos, Lottenberg Claudio Luiz, Castro Leonardo Cunha, Ventura Dora Fix
Departamento de Psicologia Experimental, Instituto de Psicologia, Universidade de São Paulo, São Paulo, Brazil.
Núcleo de Neurociências e Comportamento e Neurociências Aplicada, Universidade de São Paulo, São Paulo, Brazil.
Ophthalmol Ther. 2017 Dec;6(2):301-312. doi: 10.1007/s40123-017-0101-y. Epub 2017 Aug 9.
The purpose of this study was to measure luminance contrast sensitivity and color vision thresholdfs in normal subjects using a blue light filter lens and transparent intraocular lens material.
Monocular luminance grating contrast sensitivity was measured with Psycho for Windows (version 2.36; Cambridge Research Systems) at 3.0, 6.0, 12.0, 20.0, and 30.0 cycles per degree of visual angle (cpd) in 15 normal subjects (eight female), with a mean age of 21.6 years (SD = 3.8 years). Chromatic discrimination was assessed with the Cambridge colour test (CCT) along the protan, deutan, and tritan color confusion axes. Both tests were performed in a darkened room under two situations: with a transparent lens and with blue light filter lens. Subjective impressions were taken by subjects regarding their visual experience under both conditions.
No difference was found between the luminance contrast sensitivity measured with transparent and blue light filter. However, 13/15 (87%) of the subjects reported more comfortable vision with the blue filter. In the color vision test, tritan thresholds were significantly higher for the blue filter compared with the transparent filter (p = 0.003). For protan and deutan thresholds no differences were found.
Blue-yellow color vision is impaired with the blue light filter, and no impairment occurs with the transparent filter. No significant differences in thresholds were found in the luminance contrast sensitivity comparing the blue light and transparent filters. The impact of short wavelength light filtering on intrinsically photosensitive retinal ganglion cells is also discussed.
本研究的目的是使用蓝光滤光镜片和透明人工晶状体材料测量正常受试者的亮度对比敏感度和色觉阈值。
使用适用于Windows的Psycho（版本2.36；剑桥研究系统公司）测量15名正常受试者（8名女性）单眼的亮度光栅对比敏感度，视角分别为3.0、6.0、12.0、20.0和30.0周/度（cpd），平均年龄21.6岁（标准差=3.8岁）。使用剑桥颜色测试（CCT）沿红色、绿色和蓝色颜色混淆轴评估色觉辨别能力。两项测试均在暗室中两种情况下进行：使用透明镜片和使用蓝光滤光镜片。受试者对两种情况下的视觉体验给出主观感受。
使用透明镜片和蓝光滤光镜片测量的亮度对比敏感度之间未发现差异。然而，13/15（87%）的受试者报告使用蓝光滤光片时视觉更舒适。在色觉测试中，与透明滤光片相比，蓝光滤光片的蓝色阈值显著更高（p=0.003）。对于红色和绿色阈值，未发现差异。
蓝光滤光片会损害蓝黄色觉，而透明滤光片不会造成损害。比较蓝光滤光片和透明滤光片时，亮度对比敏感度阈值未发现显著差异。还讨论了短波长光过滤对内在光敏视网膜神经节细胞的影响。
