This is a library for optical calculations built upon truncated power series algebra implemented in VB.net. It represents optical systems as maps from a starting surface to an ending surface. The surfaces are themselves specified as truncated power series. The maps include path lengths; the library calculates interference as path length differences, and shearing is handled correctly through mixed-form maps. The library includes a rudimentary front end for interpreting a simple language for optical-system specification, a dll, and an optical glass library of commercial glasses.