Scheimpflug-based derived aberrometry before and after implantation of different combinations of intracorneal ring segments (ICRS) in keratoconus - Alejandre N; Perez-Merino P; Quintana S; Pascual P; Jimenez-Alfaro Morote, Ignacio; Marcos S (Investigative Ophthalmology & Visual Science, 2015)