Q99.812

Clinical Causes: Mutations in specific genes involved in the development and function of the inner ear and retina. Inheritance pattern is autosomal recessive, meaning a person must inherit two copies of the faulty gene (one from each parent) to be affected. Genetic testing can identify mutations responsible for the syndrome, although the exact gene involved can vary among individuals.

Key Symptoms: Hearing loss that is moderate to severe from a young age. Progressive loss of vision, often beginning with difficulty seeing in low light or at night. Night blindness, an early sign of retinitis pigmentosa. Gradual constriction of the visual field, leading to tunnel vision over time. Photophobia, sensitivity to bright lights that may develop as the condition progresses. Difficulty adapting to darkness and night vision problems may lead to challenges with mobility.

Diagnosis Path: Hearing tests (audiometry) to evaluate the degree of hearing impairment. Eye examinations, including visual field testing and electroretinography (ERG), to assess retinal function. Genetic testing to identify specific gene mutations associated with Usher syndrome type 2. Medical history review, focusing on hearing and vision changes from an early age.

Treatment Protocols: Hearing aids or cochlear implants to enhance hearing capabilities. Visual aids and specialized training to assist with remaining vision. Regular ophthalmologic and audiologic evaluations to monitor progression. Orientation and mobility training to assist with navigation and independence. Support services such as counseling and support groups for individuals and families affected by the syndrome. Potential future therapies, including gene therapy, are under research but are not yet widely available.