Sudden Loss Of Vision

Question 0

What is ischaemic optic neuropathy?

Answer 0

Due to arteritis or atherosclerosis
Occlusion of short posterior ciliary arteries (damage optic nerve)
Altitudinal field defects

Question 1

Common causes of sudden painless loss of vision

Answer 1

Ischaemic optic neuropathy
Occlusion of central retinal vein 
Occlusion of central retinal artery
Vitreous haemorrhage
Retinal detachment

Question 2

What is central retinal vein occlusion?

Answer 2

Incidence increases with age
More common than arterial occlusion
Caused by glaucoma, polycythaemia and HTN
Retinal haemorrhages seen on fundoscopy

Question 3

What is central retinal artery occlusion?

Answer 3

Due to thromboembolism or arteritis
Afferent pupillary defect
“Cherry red” spot on pale retina

Question 4

Causes of vitreous haemorrhage

Answer 4

Diabetes, bleeding disorders