Experimental Ophthalmology, Saarland University, Germany.
Z Med Phys. 2013 May;23(2):120-8. doi: 10.1016/j.zemedi.2013.02.001. Epub 2013 Mar 1.
Protectional eyewear has to fulfill both mechanical and optical stress tests. To pass those optical tests the surfaces of safety spectacles have to be optimized to minimize optical aberrations.
Starting with the surface data of three measured safety spectacles, a theoretical spectacle model (four spherical surfaces) is recalculated first and then optimized while keeping the front surface unchanged. Next to spherical power, astigmatic power and prism imbalance we used the wavefront error (five different viewing directions) to simulate the optical performance and to optimize the safety spectacle geometries.
All surfaces were spherical (maximum global deviation 'peak-to-valley' between the measured surface and the best-fit sphere: 0.132mm). Except the spherical power of the model Axcont (-0.07m(-1)) all simulated optical performance before optimization was better than the limits defined by standards. The optimization reduced the wavefront error by 1% to 0.150 λ (Windor/Infield), by 63% to 0.194 λ (Axcont/Bolle) and by 55% to 0.199 λ (2720/3M) without dropping below the measured thickness.
The simulated optical performance of spectacle designs could be improved when using a smart optimization. A good optical design counteracts degradation by parameter variation throughout the manufacturing process.
防护眼镜必须同时满足机械和光学压力测试。为了通过这些光学测试，安全眼镜的表面必须进行优化，以将光学像差最小化。
从三个测量安全眼镜的表面数据开始，首先重新计算理论眼镜模型（四个球面），然后在保持前表面不变的情况下进行优化。除了球面光焦度、散光光焦度和棱镜不平衡外，我们还使用波前误差（五个不同的观察方向）来模拟光学性能并优化安全眼镜的几何形状。
所有表面都是球面的（测量表面和最佳拟合球之间的最大全局偏差“峰谷”为 0.132mm）。除了模型 Axcont 的球镜光焦度（-0.07m(-1))外，所有模拟的光学性能在优化之前都优于标准定义的限制。优化将波前误差降低了 1%至 0.150 λ（Windor/Infield），降低了 63%至 0.194 λ（Axcont/Bolle），降低了 55%至 0.199 λ（2720/3M），而没有低于测量的厚度。
当使用智能优化时，可以提高眼镜设计的模拟光学性能。良好的光学设计可以抵抗制造过程中参数变化引起的劣化。
