To the surface erosion in small, shallow level of patients, the spherical electrode ablation is recommended;
侵蚀面小、水平浅的患者建议使用球形电极消融术；
2
Along with the optical design, processing, testing technology to raise the level of non-spherical optical system has gradually become the most widely used and one of the most effective components.
随着设计、加工、测试技术水平的提高，非球面已逐渐成为光学系统中应用最广泛、最有效的元件之一。
3
High level of functionality at low cost ? Extremely compact ? Spherical front mount on ELF4 enables infinite adjustability ? Flush red lens ? IP67 rated for harsh environments.