Official websites use .gov
A .gov website belongs to an official government
organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to
the .gov website. Share sensitive information only on official,
secure websites.
Classification 2025 Summer Edition
Worldwide source of medical classification resourcesClass Index
See also Lighting
See also Luminescent Measurements
See also Photobiology
See also Photochemistry
See also Photometry
See also Photosensitivity Disorders
See also Photosynthesis
See also Phototherapy
See also Sunlight
See also Ultraviolet Therapy