Yao Qijun is known to readers mainly as the author of Optics Tutorial. The book has reached its sixth edition and is an educational textbook commonly used for teaching and self-study in optics courses. Public information about Yao Qijun is limited: his nationality, dates of birth and death, education, and professional career are not clearly recorded, so no speculation is made here. Judging from the work available, his writing is aimed at classroom use and basic training, with attention to explaining fundamental optical concepts, principles, and problem-solving methods clearly, and its structure is suited to step-by-step learning. As the author of a textbook revised over a long period, his contribution lies mainly in textbook development and the transmission of knowledge; the book's continued republication also indicates a certain stability in teaching use. Overall, Yao Qijun is an author distinguished by his work in compiling optics textbooks, and his influence operates mainly through the teaching role of Optics Tutorial.
