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A member asked:

How much vision has been lost by the time a defect is detected on the field vision test?

A doctor has provided 1 answer
Dr. Michael Manning answered

Specializes in Ophthalmology

Approximately 20%: As much as 20% of the optic nerve fibers can be damaged by disease such as glaucoma before a defect will show up on a visual field test.

Answered 12/30/2012

5.4k views

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