optic neuritis

Question 1

what is optic neuritis

Answer 1

inflammatory condition - affects optic nerve

Question 2

presentation of optic neuritis

Answer 2

• sudden visual loss - acute, unilateral, occurs over days
• pain on eye movement - can precede vision loss
• change in colour perception (dyschromatopsia) - red-green
• RAPD
• visual field defects inc central scotoma, altitudinal defects, arcuate scotoma, depression of sensitivity in all quadrants
• difficulty adapting to light
• uhthoff’s phenomenon
• bilateral less common

Question 3

most common association with optic neuritis

Answer 3

MS

Question 4

ix and exam for optic neuritis

Answer 4

examination
field testing
MRI

Question 5

mx of optic neuritis

Answer 5

steroids - reduce inflammation and speed up recovery
sx mx

Question 6

fundoscopy for visual field defects

Answer 6

normal
optic disc swelling - papillitis
peripapillary haemorrhages
optic disc pallor - sign of axonal loss