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.
How many people are affected by X-linked congenital stationary night blindness ?
<s>[INST] Answer the question truthfully, you are a medical professional. This is the question: How many people are affected by X-linked congenital stationary night blindness ? [/INST] \n 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.</s>