> For the complete documentation index, see [llms.txt](https://simplemetalens.gitbook.io/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://simplemetalens.gitbook.io/docs/smd-pro/topical-discussions.md).

# Knowledge Base

This section provides discussions on some SMD PRO features as well as optical theories in the context of metalenses.