legal blindness - vision that is 20/200 or worse in both eyes (20/200 vision is the ability to see at 20 feet what a normal eye can see at 200 feet) blindness, cecity, sightlessness - the state of being blind or lacking sight.
In this review, we outlined those postural reflexes related to pathways and structures involving the cervical spine, the eyes, and the inner ear. How these structures and pathways obtain somatosensory input, interact with each other, and modulate postural changes and corrections has been described here.
Clinical Exam. 1  The afferent part of the PLR shares some common pathways (up to the level of the optic tract) with the visual pathways. While axons involved in vision reach the conscious level after synapse with the lateral geniculate nucleus, the axons involved in the PLR synapse with a third neuron in the pretectal nucleus.