Septo-optic dysplasia, also known as DeMorsier’s syndrome or optic nerve hypoplasia, is a rare, genetic condition characterized by a combination of visual, neurological and hormonal conditions. The visual part of the syndrome is called optic nerve hypoplasia. This occurs because the optic nerve does not fully develop during gestation so it cannot transmit the proper signals to the brain. Visually, the effects can range from inconsequential vision loss to severe visual impairment (light sensitivity and nystagmus are also common). The brain issues are due to abnormal development of the middle part of the brain called the septum pellucidum. This can cause difficulty for the brain in interpreting the signals sent by the underdeveloped optic nerve. Also, learning disabilities, developmental delays and varying degrees of mental disabiliites may result from this condition. Hormonal problems may also occur and result in pituitary gland malfunction, making the body deficient in growth hormones.

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