Clinical Research Directory

Inclusion Criteria: * Age 18 years * Self-perceived mild-to-moderate hearing difficulties/ hearing loss * Competent smartphone use (able to complete self-fitting via the app) * Able and willing to provide informed consent * HHIA screening consistent with perceived hearing difficulty * Willingness and ability to attend two in-person research appointments * Ability to operate a SmartPhone Exclusion Criteria: * Conductive or mixed hearing loss * Occluding cerumen * Otologic disease/ active ear pathology * Severe or profound hearing loss (PTA \>S0dBHL) (WHO, 2021) * Presence of (red-flag) conditions relevant to OTC hearing aid use (per 21 CFR 801.421) * Visible deformity of the ear (congenital or traumatic). * Fluid, pus, or blood coming from the ear (e.g., active drainage). * Sudden or rapidly progressive hearing loss within the recent past (often defined as within \~90 days). * Any acute or chronic dizziness or vertigo associated with hearing issues. * Pain or discomfort in or around the ear. * Visible evidence of significant cerumen (ear wax) accumulation or foreign body in the ear canal. * Unilateral hearing loss of sudden onset or large asymmetry between ears. * Audiometric air-bone gap suggestive of possible conductive pathology (e.g., gap equal or more than 15 dB at key frequencies) * Visible evidence of significant cerumen (ear wax) accumulation or foreign body in the ear canal. * Unilateral hearing loss of sudden onset or large asymmetry between ears