Pupillometry Techniques Usage to Quantify the Programming Parameters Effect in the Auditory Effort in Zti Opticon Cochlear Implant Adult Users

Inclusion Criteria: * Users willing to participate in the study with signature and date of the Informed Consent. * Age between 18 and 70 years old. * At least 6 months experience with the Neuro Zti implant and Neuro 2 processor. * Unilateral, bilateral and bimodal users. * Basic understanding of oral and written Spanish. * Normal or corrected vision. Exclusion Criteria: * Speech or language disorder. * Added comorbidities or cognitive dysfunction. * Not approval to participate in the study or absence in some of the programmed sessions for the Cochlear Implant.