H31.21

Clinical Causes: Genetic mutations: Choroideremia is caused by mutations in the CHM gene, which provides instructions for making a protein essential for the health and function of eye tissues. Inheritance pattern: The condition is inherited in an X-linked manner, meaning males are more frequently and severely affected, while females may be carriers without significant vision loss.

Key Symptoms: Gradual loss of peripheral (side) vision, often unnoticed in early stages. Progressive narrowing of the visual field over time. Difficulty adjusting to low-light conditions or twilight vision. Potential decrease in central vision in advanced stages. In some cases, eye sensitivity or photographs show abnormal pigmentation or degeneration in the retina.

Diagnosis Path: Diagnosis of choroideremia involves a comprehensive eye examination, including: - Visual acuity testing to assess clarity of vision. - Visual field tests to determine peripheral vision loss. - Retinal imaging (like fundus photography) to observe characteristic degenerative changes. - Electrophysiological testing such as electroretinography (ERG) to evaluate retinal function. - Genetic testing may confirm mutations in the CHM gene, supporting the diagnosis.

Treatment Protocols: Currently, there is no cure for choroideremia. Management focuses on monitoring vision and addressing complications. Potential approaches include: - Regular eye examinations to track disease progression. - Low vision aids and support services to maximize remaining vision. - Emerging therapies, such as gene therapy research, are under investigation and may offer future treatment options. - Patients are advised to protect their eyes from injury and UV exposure. - Patients may also benefit from counseling and support groups for coping with progressive vision loss.