Vinger P F, Parver L, Alfaro D V, Woods T, Abrams B S
Tufts Medical School, Medford, Mass, USA.
JAMA. 1997 Jan 8;277(2):142-4.
To evaluate the relative strength and shatter resistance of spectacle lenses currently used in sunglasses and dress, sports, and industrial eyewear.
Seven lenses that met the US American National Standards Institute (ANSI) Z80 standards for dress glasses (made of high-index plastic, allyl resin plastic, heat tempered glass, chemically tempered glass, and polycarbonate, and with center thickness ranging from 1 mm to 2.2 mm) and 4 lenses that met ANSI Z87 standards for industrial safety eyewear (allyl resin plastic, heat-tempered glass, chemically tempered glass, and polycarbonate, all with 3.0-mm center thickness) were tested for impact resistance to 5 projectiles (air gun pellets, golf balls, tennis balls, lacrosse balls, and baseballs).
Impact energy required to shatter spectacle lenses.
Based on 348 lens impacts, dress and industrial lenses made from glass, allyl resin plastic, and high-index plastic shattered at impact energies less than those expected to be encountered from the test projectiles during their routine use. Polycarbonate lenses demonstrated resistance to impact for all tested projectiles exceeding the impact potential expected during routine use.
Under the test conditions of this study, polycarbonate lenses demonstrated greater impact resistance than other commonly used spectacle lenses that conform to prevailing eyewear standards. These findings suggest that current ANSI Z80 and ANSI Z87 standards should be reevaluated.
评估目前用于太阳镜、时装眼镜、运动眼镜和工业护目镜的镜片的相对强度和抗破碎性。
对七副符合美国国家标准学会（ANSI）Z80时装眼镜标准的镜片（由高折射率塑料、烯丙基树脂塑料、热钢化玻璃、化学钢化玻璃和聚碳酸酯制成，中心厚度在1毫米至2.2毫米之间）以及四副符合ANSI Z87工业安全护目镜标准的镜片（烯丙基树脂塑料、热钢化玻璃、化学钢化玻璃和聚碳酸酯，中心厚度均为3.0毫米）进行了针对5种投射物（气枪子弹、高尔夫球、网球、长曲棍球和棒球）的抗冲击性测试。
使眼镜镜片破碎所需的冲击能量。
基于348次镜片冲击测试，由玻璃、烯丙基树脂塑料和高折射率塑料制成的时装眼镜和工业眼镜镜片在低于其日常使用中测试投射物预期遇到的冲击能量下就破碎了。聚碳酸酯镜片对所有测试投射物均表现出抗冲击性，超过了日常使用中预期的冲击势能。
在本研究的测试条件下，聚碳酸酯镜片比其他符合现行眼镜标准的常用眼镜镜片表现出更强的抗冲击性。这些发现表明当前的ANSI Z80和ANSI Z87标准应重新评估。
