Rosenthal F S, Bakalian A E, Taylor H R
Am J Public Health. 1986 Oct;76(10):1216-20. doi: 10.2105/ajph.76.10.1216.
Several studies have suggested that ultraviolet radiation in sunlight may cause cataracts and other eye disease. We evaluated the effect of prescription eyewear in attenuating ocular exposure to ultraviolet radiation (UVR) in the sunlight portions of the ultraviolet spectrum (295-350 nm). Using natural sunlight as the source, the attenuation was measured with two ultraviolet detectors, one sensitive to only UVB (295-315 nm) and one sensitive to both UVA and UVB (295-350 nm). A random sample of spectacles, spectacle lenses, and contact lenses was examined. The average transmission, as measured with either detector, was highest for soft contact lenses, followed by glass spectacle lenses, untinted hard contact lenses, and plastic spectacle lenses. Measurements performed with mannikins wearing spectacles showed that an average of 6.6 per cent of incident radiation reached the eye even when the lenses were covered with black opaque tape. The amount of exposure was increased substantially when the spectacles were moved 0.6 cm away from the forehead. The results show that the protection against ultraviolet exposure provided by prescription eyewear is highly variable and depends largely on its composition, size, and wearing position.
多项研究表明，阳光中的紫外线辐射可能会导致白内障及其他眼部疾病。我们评估了处方眼镜在减弱眼睛对紫外线光谱（295 - 350纳米）中阳光部分紫外线辐射（UVR）的作用。以自然阳光为光源，使用两个紫外线探测器测量衰减情况，一个仅对UVB（295 - 315纳米）敏感，另一个对UVA和UVB（295 - 350纳米）均敏感。对眼镜、眼镜镜片和隐形眼镜进行了随机抽样检查。用任一探测器测量时，软质隐形眼镜的平均透过率最高，其次是玻璃眼镜镜片、无色硬质隐形眼镜和塑料眼镜镜片。对佩戴眼镜的人体模型进行的测量表明，即使镜片用黑色不透明胶带覆盖，平均仍有6.6%的入射辐射能到达眼睛。当眼镜从额头移开0.6厘米时，暴露量会大幅增加。结果表明，处方眼镜提供的紫外线防护效果差异很大，很大程度上取决于其组成、尺寸和佩戴位置。
