A member asked:

On average what percentage of optic nerve damage must there be in order to show a loss of peripheral vision on a field test?

3 doctors weighed in across 2 answers
Dr. David Lundin answered

Specializes in Neurosurgery

Very sensitive : Formal visual field testing can pick up very small defects due to optic nerve damage. The test can be affectedy your ability to stay focused however.

Answered 6/2/2019

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Difficult to tell: Depends on what instrument is used to access the eye.

Answered 3/7/2015

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