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The optical principles are, holography, speckle interferometry, structured light, multi-spectral imaging, shearography, stereo vision, tracking, etc ....
Most of these principles are based on digital imaging.
A fundamental step in each of these processes is the image processing, which can incorporate several aspects of calibration, which allows at the end to get real optical metrology tools.
Deformations
Many optical technologies are proposed for the measurement of surface deformation : speckle interferometry provides measurement accuracy of 0.1 micron and CorreliSTC ® imaging technic allows easy access to 3D displacement mapping. 
Vibration
Holo3 provides methods for vibration measurement based on laser techniques : the laser vibrometer allows vibration measurement without tedious preparation (like bending accelerometers...)The techniques of speckle interferometry provide full field data. They are particularly effective in modal analysis and as an investigative tool in cases of complex vibrational behavior.
3D digitization
The evolution of digital cameras (speed, spatial resolution) and in computational algorithms (like phase calculation) gave rise to 3D imaging techniques. Through rogorous calibration procedures, a camera ca become a real tool for dimensional metrology.
Virtual Reality
The immersive display and virtual reality device is composed of a stereoscopic display system coupled to a movement capture system.
Non-destructive techniques
The parts are controlled by application of mechanical stress, pneumatic or thermal energy.
Tracking
The principle is to used a camera that is imaging one or several targets (tracking). When the system is calibrated we obtain the displacement of a point in space as a function of time.
Multispectral imagery
While in conventional color imaging, three different images corresponding to the Red Green and Blue colors are grabbed, in multispectral imagery more images are snapped, each image corresponding to a very narrow band of the visible spectrum.
Cosmetic defects
The formation of an image in a camera is based primarily on a fundamental otpical characteristic of the surfaces : its bi-directional reflectance. (BRDF)