1st April 2022

A 50-year old industrial worker presents with a 2-month history of blurry vision

A 50-year old industrial worker presents with a 2-month history of blurry vision. More recently, he also started to complain of abdominal cramps and tingling in his fingers. You suspect lead poisoning and treat him accordingly. His visual symptoms remain, and you refer him to ophthalmology for further investigations.

Which of the following is the gold standard investigation for toxic optic neuropathy? 

Select the SINGLE most appropriate option from the list below. Select ONE option only.