A person with Optic Nerve Hypoplasia (ONH) has small eye nerves (optic nerves) from the eye to the brain. Some people with ONH also have an abnormal brain and a poorly functioning pituitary gland. This brochure explains the problems that can occur in children with ONH. Your child may have none, any or all of these problems in a mild or more serious form. Depending on the person's problem sometimes the disease is called Optic nerve Hypoplasia (ONH), septo-optic dysplasia, or De Morsier's syndrome.

The eyes receive light from the outside world and send these pictures to the brain along the optic nerves.