A professional who this group includes occupations concerned with fabricating and repairing optical instruments, such as microscopes, field glasses, opera glasses, and telescopes; optical measuring and testing instruments, such as refractometers, spectrometers, spectroscopes, colorimeters, and polariscopes; and optical range finders, bombsights, and fire-control instruments.

• Occupations concerned with fabricating and repairing optical lenses are included in group 716.