The first commercial comparator was a creation of James Hartness and Russell W. Porter.
Optical fiber | Optical resolution | Optical disc authoring | National Optical Astronomy Observatory | Halo (optical phenomenon) | Optical fiber cable | Optical attenuator | Optical aberration | Vavilov State Optical Institute | RC Optical Systems | Optical telescope | optical telescope | Optical space | optical mouse | Optical fiber connector | optical fiber | Optical disc drive | Optical disc | optical disc | Optical dating | Optical coating | Okaya Optical | Magneto-optical trap | Large Optical Test and Integration Site | Journal of the Optical Society of America | European Optical Society | British Optical Association | 3D optical data storage |