Fields J M, Goldsmith W
Am J Optom Physiol Opt. 1983 Aug;60(8):725-38. doi: 10.1097/00006324-198308000-00011.
An experimental investigation was conducted to determine the frangibility of ophthalmic glass lenses loaded by the impact of steel spheres with diameters ranging from 6.35 to 28.6 mm when dropped from heights up to 1.905 m. These lenses were supported either simply, by a ring similar to that used in U.S. Food and Drug Administration (FDA) drop tests, or while inserted in three different commercially used frame configurations placed on a head form. Strains up to 4000 mu strain were recorded by gauges cemented to the lenses, and impact forces on the glass up to 10.2 kN were determined, with many lenses surviving. Plano lenses tested according to FDA standards experienced peak values of 2300 mu strain. The maximum force transmitted to the head form at the nose piece was found to be 91 N as determined by embedded crystal transducers. A series of special tests on circular plano lenses inserted in specially constructed rings and a circular eyewire indicated that eyewire tension is not a significant factor in impact resistance of lenses under both static and dynamic loading.
进行了一项实验研究，以确定直径范围为6.35至28.6毫米的钢球从高达1.905米的高度落下撞击时，眼科玻璃镜片的易碎性。这些镜片要么通过类似于美国食品药品监督管理局（FDA）跌落测试中使用的环简单支撑，要么插入放置在头模上的三种不同商业使用的镜框配置中进行支撑。通过粘贴在镜片上的应变片记录到高达4000微应变的应变，并确定了作用在玻璃上高达10.2千牛的冲击力，许多镜片都未破碎。根据FDA标准测试的平光镜片经历了2300微应变的峰值。通过嵌入式晶体传感器确定，传递到头模鼻托处的最大力为91牛。对插入特殊构造的环和圆形镜框线中的圆形平光镜片进行的一系列特殊测试表明，在静态和动态载荷下，镜框线张力不是影响镜片抗冲击性的重要因素。
