Occupational Therapy (OT): A clinical program aimed at improving fine motor skills and adaptive skills for people with
disabilities. Primary goal is to maximize a person's functional potential in all environments (home, school, community).

Ophthalmologist: A physician who specializes in treating the eye and diseases of the visual system.

Optokinetic: Relating to movement of the eyes when visually following a moving object.

Optometrist: A Professional who performs eye examinations and prescribes glasses.

Oral motor: Relating to the movement of muscles in and around the mouth.

Oral tactile defensiveness: An over-sensitivity to touch around the mouth.

Oral-motor problems: Difficulty sucking and/or swallowing due to a lack of coordination of the muscles responsible for these functions.

Orthodontist: A dentist who specializes in correcting irregularities of teeth and/or jaw alignment.

Orthopedic: Relating to the bones, joints.

Orthopedic Disability: An impairment that affects the bones, joints. Individuals with cerebral palsy may be classified as having an orthopedic disability as the basis for receiving special education services.

Orthopedist: A physician specializing in bones and joints. A medical doctor who specializes in preventing or correcting orthopedic problems.

Orthoses: Any device to stabilize or immobilize a body part, prevent deformity, protect from injury, or assist with function
(casts, braces, etc).

Orthotics: Lightweight devices made of plastic, leather, or metal which provide stability at the joints or passively stretch the muscles.

Osteotomy: An operation to cut and realign the bones; for example, to change the angle of the femoral bone and the hip joint.

Otitis media: inflammation of the middle ear due to bacterial infection or other causes.