Binaural Hearing Loss
Binaural hearing loss is hearing loss present in both ears. It may be symmetric, meaning the degree and configuration of loss are similar in both ears, or asymmetric, meaning the ears differ meaningfully in how much or what type of hearing loss is present. Binaural hearing loss is the most common pattern in adults with age-related or noise-induced hearing loss, where both ears are typically affected.
When hearing loss affects both ears, the auditory system loses some of its natural ability to compare timing and loudness differences between ears, which reduces the ability to locate sounds and separate a speaker's voice from background noise. These binaural processing advantages are most apparent in complex listening environments and are part of why audiologists typically recommend fitting both ears when both have measurable loss.
Asymmetric binaural hearing loss, where one ear is considerably poorer than the other, warrants investigation to rule out conditions such as vestibular schwannoma, sudden sensorineural hearing loss, or other unilateral pathology. The audiological assessment compares thresholds, speech understanding, and acoustic reflex results between ears to identify any medically significant asymmetry.
