Please enable JavaScript.
Coggle requires JavaScript to display documents.
Optic Nerve and Visual Pathway - Coggle Diagram
Optic Nerve and Visual Pathway
Afferent Visual pathway
Structures responsible for perceiving relaying and processing visual informaiton
Retina, optic nerves, chiasm, tracts, lateral geniculate nuclei, optic radiations, occipital striate cortex
Macula: Fovea is the center of the macula
The optic disc: 1.2 million axons coalesce to form the optic nerve
Deficiencies
One Eye: Optic Nerve
Bitemporal: Optic Chiasm
Homonymous: Posterior to the chiasm
Superior Defects: Relatively inferior
Inferior defects: Relatively superior
Retrochiasmal lesions: Lesion opposite side to the field defect
Optic Nerve
Function
COnduct electrical signal from eye to brain to form basis for vision
Assess Function
Visual acuity, color vision, Pupillary responses, confrontation visual fields
Optic Neuropathy
Abnormal optic nerve function
Normal Optic Disc
Color: Orange/pink
Margins: Distinct
Cup to disc ratio: 0.3
Optic Disc Abnormalities
Congenital
Optic nerve hypoplasia, myelinated nerve fibre layer, tilted disc syndrome, optic nerve coloboma
Acquired
Normal (inflammatory, ischemic)
Swollen (blurred margin, decreased cup to disc ratio), True Edema (Papilledima, Primary optic neuropathy), Pseudo-edema (Drusen<
Pale/Atrophy Optic Disc: Ishcemic optic neuropathy/Chronic progressive optic neuropathy
Cupping: Cup appears pale, and rim has mild pallor, large cup to disc ratio
Glaucoma/Compressive Optic Neuropathy presents with cupped optic disc