Neurodevelopmental disorder with spastic diplegia and visual defects (NEDSDV) is characterized by global developmental delay, impaired intellectual development, axial hypotonia, and dysmorphic craniofacial features with microcephaly. Many patients have visual abnormalities, ranging from strabismus to optic nerve atrophy and retinal abnormalities. Affected individuals also develop spasticity, particularly of the lower limbs, and may have behavioral abnormalities. [From OMIM]