The<unk><unk>  consists of structures that carry<unk>  information from the retina to the brain.<unk>  in that<unk>  cause a variety of<unk>  field defects. In the<unk>  system of human eye, the<unk>  information processed by retinal photoreceptor cells travel in the following way: Retina→Optic nerve→Optic chiasm (here the nasal<unk>  field of both eyes cross over to the opposite side)→Optic tract→Lateral geniculate nucleus→Optic radiation→Primary and secondary<unk>  cortices. The type of field defect can help localize where the<unk> is located (see picture given in infobox).
Visual pathway lesions
Subacute myelo-optic neuropathy
Neurogenic inflammation
Small fiber peripheral neuropathy
Basal ganglia disease
Central chromatolysis
Neurocristopathy
Neurolathyrism