Derek Lacey specialises in providing hearing aids for patients with hearing problems. He will provide hearing tests on a case by case basis. An audiologist is a healthcare professional specializing in identifying, diagnosing, treating and monitoring disorders of the auditory and vestibular system portions of the ear. Audiologists are trained to diagnose, manage and treat hearing or balance problems. Audiologists have training in anatomy and physiology, hearing aids, cochlear implants, electrophysiology, acoustics, neurology, counseling and sign language.