Davis J K
Am J Optom Physiol Opt. 1978 Aug;55(8):543-52. doi: 10.1097/00006324-197808000-00003.
Improvements in polycarbonate material, production techniques, and scratch-resistant coatings, combined with a process-oriented design, have resulted in a precision lens series. Surface quality is comparable to that of untreated glass ophthalmic lenses. The repeatability of the process results in closely controlled axial power and off-axis performance. For most lens prescriptions, the ANSI Z80.1 optical-center specifications for prescription accuracy are maintained through a total field of view of 40 deg for an 8-mm range of center-of-rotation distances. Off-axis astigmatism is controlled for near-point seeing. The lenses are both lighter and thinner than those of crown glass. A scratch-resistant coating reduces the reflections normally associated with high-index (1.586) materials. Impact resistance exceeds that required by ANSI Z80.7 and is many times that required by ANSI Z80.1.
聚碳酸酯材料、生产工艺和防刮涂层的改进，再加上以工艺为导向的设计，造就了一个精密镜片系列。其表面质量可与未处理的玻璃眼科镜片相媲美。该工艺的可重复性使得轴向屈光力和离轴性能得到严格控制。对于大多数镜片处方，在8毫米旋转中心距离范围内的40度全视场中，均可维持ANSI Z80.1规定的处方精度光学中心规格。离轴散光在近点视力时得到控制。这些镜片比冕牌玻璃镜片更轻、更薄。防刮涂层减少了通常与高折射率（1.586）材料相关的反射。抗冲击性超过了ANSI Z80.7的要求，是ANSI Z80.1要求的许多倍。
