  This short textbook was written for someone who newly start studying, doing
research, or development about optical coherence tomography (OCT) or using OCT.
The first chapter summarizes the concept and the history of OCT. In the second
chapter, the technologies of OCT are summarized, which includes the
mathematical principle, hardware implementation, the instructions for designs
such as interferometer and wavelength selections, and theories of resolutions
and sensitivity. In the third chapter, some examples of ophthalmic applications
of OCT are described. In the last chapter, instructions for next learning steps
are given.
