• Clinical science

Disorders of the visual pathway

Overview

The visual pathways transmit signals from the retina to the visual cortex (striate cortex, brodmann area 17).

Structure Characteristics Lesions Causes
Retina
  • Cones and rods transform light into visual signals, which are projected to the brain via the optic nerve.
Optic nerve
  • Transmits visual information from the ipsilateral retina to the brain
  • Afferent limb of pupillary reflex and accomodation reflex
Optic chiasm
  • Fibers from nasal part of the retina cross to contralateral side
  • Fibers from the temporal part of the retina do not cross to the contralateral side
Optic tract

Lateral geniculate nucleus (LGN)

Optic radiations
Visual cortex

Unilateral visual field loss → pathology mainly in front of the optic chiasm. Bilateral visual field loss → pathology mainly in or behind the optic chiasm

References:[1][2]

Prechiasmal visual pathway damage

Prechiasmal damage to the visual pathway mainly involves the optic nerve.For retinal diseases see table above.

Optic nerve

Optic neuritis

Multiple sclerosis is the most common cause of optic neuritis!

Optic atrophy

Anterior ischemic optic neuropathy (AION)

Immediate high-dose glucocorticoid treatment is essential in AAION!

Papilledema

Damage in the region of the optic chiasm

Retrochiasmal visual pathway damage

last updated 12/05/2019
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