Conditions

Hearing loss and deafness affect individuals of all ages and may occur at any time from infancy through old age. Hearing impairment is defined by the Individuals with Disabilities Education Act (IDEA) as, "[...] an impairment in hearing, whether permanent or fluctuating, that adversely affects a child's educational performance."

The term "developmental disorder" or "developmental disability" means a severe, chronic disability of an individual that: is attributable to a mental or physical impairment, or combination of mental and physical impairment is manifested before the individual attains the age of 22 is likely to...

Down syndrome, also known as Trisomy 21, is the most common and readily identifiable chromosomal condition associated with intellectual disabilities. It is a genetic disorder that occurs in approximately one of 700 births in the United States.

It is a disorder that affects boys almost exclusively. Parents may first see that their three-to-five year old child has frequent falls, runs slowly, or has toe-walking or a waddling gait. The child’s calves are often unusually large. Weakness is initially most pronounced in the hips and upper leg...

Dystonia may affect a single muscle, a group of muscles, or muscles throughout the body. The cause of dystonia is unknown in most cases, although some forms are attributed to genetics. Symptoms may initially appear mild and progress with prolonged exertion, stress, or fatigue. Dystonia can also...