Steinert myotonic dystrophy is also known as myotonic dystrophy. It is transmitted via an autosomal dominant in¬ heritance and is the most common form of muscle disease. It is a multisystem disease typically affecting other tissues as well as skeletal and smooth muscles. This disorder can affect the eyes, heart, endocrine system, and central nervous system. Steinert myotonic dystrophy can affect people at any age, but the majority of people are diagnosed by their early 20s.