Version 10.0 of Code V optical design software has been released by Optical Research Associates. It offers improved accuracy for diffraction analysis and performs parallel processing on multicore-architecture CPUs. The Beam Synthesis Propagation feature employs a beamlet-based diffraction propagation algorithm to include diffraction effects through the entire optical system design. It analyzes systems with astigmatic beams, polarized input optical fields, low f numbers and noncontiguous pupils, and it aids in near-field diffraction analysis and in optical systems where the amplitude or phase is modified near the focus. A preanalysis feature provides input recommendations for specific lens systems.