After obtaining informed consent, patients underwent biomicroscopy, gonioscopy, visual acuity, intraocular pressure and AS-OCT before ALPI, one week and one month after it. The AS-OCT Visante (Carl Zeiss Meditec, Dublin) took an image of the vertical and horizontal meridians at the same room illumination of 14 lux measured with a luxometer mobile application (Apple Inc., Application Manufactory available at the AppStore by June 2012).