• Optical absorbance
• Optical absorptance
• Optical absorptivity
• Optical anamorphism
• Optical anamorphosis
• Optical apparatus
• Optical attenuator
• Optical autocorrelator
• Optical bandsplitter
• Optical birefringence
• Optical bistability
• Optical bombsight
• Optical chirality
• Optical coherence tomography
• Optical collimation
• Optical collimator
• Optical coronagraph
• Optical correlator
• Optical crosspoint
• Optical cuvette