optic nerve disease,papillaedema optic atropy, visual field

Optic nerve disease

papilloedema

optic atropy,

visual field defects

Optic nerve diseases

• Definitions Optic disc oedema swollen disc, used to describe the optic nerve head affected by a variety of local and systemic

causes Papilloedema swollen disc due to increased intracranial pressure

Optic nerve diseases

Disc oedema

• Definition Optic disc oedema swollen disc, used to describe the optic nerve head affected by a variety of local and systemic causes

Disc oedema

Disc oedema

Disc oedema• Arteritic

Disc oedema

• Papilloedema causes -space occupying lesions -blockage of the ventricular system (congenital or acquired)

-obstruction of CSF absorption -benign intracranial hypertension -severe hypertension -hypersecretion of CSF

Optic nerve diseases

• Papilloedema -bilateral disc oedema -hyperaemia of disc -absent venous pulsation in the disc -splinter haemorrhage -exudates -cotton wool spots -circumferential retinal folds -paton’s lines -obliterated central cup

Disc oedema

• Papilloedema swollen disc due to increased intracranial pressure

Disc oedema• Papilloedema

Optic Atrophy

• Causes

-central retinal artery occlusion-healed papillitis

-glaucoma -hereditary optic neuropathies -toxic and deficiency optic neuropathies -infiltrative optic neuropathy -radiation optic neuropathy -cacinomatous optic neuropathy

Optic Atrophy• Clinical diagnosis of optic atrophy

• ophthalmoscopic abnomalities of disc

• defective visual function -visual acuity -colour vision -pupils -visual fields -visual evoked potentials(VEP)

Optic Atrophy

Optic Atrophy

Visual field defects• Normal visual field

Visual field defects

Visual field defects

• Blind right eye with left temporal hemianopia R-optic nerve lesion extending into the chiasm

Visual field defects

Visual field defects

Visual field defects

Visual field defects

Visual field defects

• Bitemporal hemianopia due to interruption of decussating nasal fibres in chiasm

Visual field defects

Visual field defects

Visual field defects

• Central bitemporal hemianopiadamage of nasal macular fibres in the chiasm

Visual field defects

• L homonymous hemianopia, R optic tract, or occipital lesion

Visual field defects

• L homonymous superior quadrantanopia R temporal lobe(Meyer’s loop)lesion

Visual field defects

• R homonymous hemianopia with macularsparing

L occipital cortex lesion

Visual field defects

Visual field defects