Photomedicine is a field of medicine that studies the use of light for diagnostic and therapeutic purposes. There are several synonyms for photomedicine that reflect the different aspects of this field. Phototherapy, light therapy, and photochemotherapy are all terms that refer to the use of light in treating medical conditions. Photodiagnostics, light diagnostics, and optical imaging are synonyms that describe the use of light in medical imaging and diagnosis. Photobiology and photomedicine are also used interchangeably to describe the science of light in medicine. Overall, these terms reflect the diverse aspects of photomedicine and demonstrate the potential of light-based therapies in medicine.