Question: What is (are) X-linked congenital stationary night blindness ?
Answer: X-linked congenital stationary night blindness is a disorder of the retina, which is the specialized tissue at the back of the eye that detects light and color. People with this condition typically have difficulty seeing in low light (night blindness). They also have other vision problems, including loss of sharpness (reduced acuity), severe nearsightedness (high myopia), involuntary movements of the eyes (nystagmus), and eyes that do not look in the same direction (strabismus). Color vision is typically not affected by this disorder. The vision problems associated with this condition are congenital, which means they are present from birth. They tend to remain stable (stationary) over time. Researchers have identified two major types of X-linked congenital stationary night blindness: the complete form and the incomplete form. The types have very similar signs and symptoms. However, everyone with the complete form has night blindness, while not all people with the incomplete form have night blindness. The types are distinguished by their genetic cause and by the results of a test called an electroretinogram, which measures the function of the retina.
Source: GHR

Question: How many people are affected by X-linked congenital stationary night blindness ?
Answer: The prevalence of this condition is unknown. It appears to be more common in people of Dutch-German Mennonite descent. However, this disorder has been reported in families with many different ethnic backgrounds. The incomplete form is more common than the complete form.
Source: GHR

Question: What are the treatments for X-linked congenital stationary night blindness ?
Answer: These resources address the diagnosis or management of X-linked congenital stationary night blindness: - American Optometric Association: Infant Vision - Gene Review: Gene Review: X-Linked Congenital Stationary Night Blindness - Genetic Testing Registry: Congenital stationary night blindness - Genetic Testing Registry: Congenital stationary night blindness, type 1A - Genetic Testing Registry: Congenital stationary night blindness, type 2A - MedlinePlus Encyclopedia: Electroretinography - MedlinePlus Encyclopedia: Eye movements - Uncontrollable - MedlinePlus Encyclopedia: Nearsightedness - MedlinePlus Encyclopedia: Strabismus - MedlinePlus Encyclopedia: Vision - Night Blindness These resources from MedlinePlus offer information about the diagnosis and management of various health conditions: - Diagnostic Tests - Drug Therapy - Surgery and Rehabilitation - Genetic Counseling - Palliative Care
Source: GHR