The Moiré deflectometry is a powerful method for non-destructive testing. Less sensitivity to mechanical vibrations is one of the most important advantages of this method and has made it widely applicable in the ophthalmology industry for laminar analysis.

Results of Moiré deflectometry is similar to interferometry technique. In this method using a pair of transmission gratings, collimated beam go through the object.

Moiré deflectogram: the map of deflected rays regarding to the optical behaviors of the object which forms fringe pattern.