Which professional is most closely associated with hearing tests and hearing aids?

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Hearing tests and fitting hearing aids are the domain of an audiologist. An audiologist specializes in identifying, characterizing, and managing hearing and balance disorders. They perform diagnostic tests such as hearing thresholds, speech testing, and tympanometry to determine the type and extent of hearing loss, and they select, program, and verify amplification devices like hearing aids, often using real-ear measurements to ensure a proper fit. They also provide counseling and rehabilitation to help people communicate effectively in daily life. The other professionals focus on vision—optometrists and ophthalmologists diagnose and treat eye conditions and prescribe corrective lenses or surgery—while a vision rehabilitation therapist helps with adapting to vision loss, not hearing. So the best answer is the audiologist.