The Shack-Hartmann wavefront sensor technology works by analyzing a beam of light, or input wave. First, the input wave is subdivided into what are called “multiple elementary beams” by a micro lens array that is composed of a matrix of miniature lenses. These multiple elementary beams are focused by the micro lens array towards a digital camera that sends the image data to software algorithms which, in turn, analyze and determine the “phase” shape of the input wave.