Shack-Hartmann aberrometry vs OQAS : the quarrel of the ancients and the moderns ?

The Optical Quality Analysis System (OQAS) has the advantage over Hartmann-Shack aberrometers of being capable of measuring both wavefront aberrations and scatter. In patients with eyes with mild scatter, both techniques give similar results. However in eyes severe amount of scatter, Hartmann-Shack aberrometry may overestimate the quality of vision. On the other hand, the OQAS suffers from a certain level of background noise, generated by the choroid. During this presentation we will determine the current indications for those two techniques.