2 doctors weighed in:

How big of a visual field defect would be an eye problem while driving?

2 doctors weighed in
Dr. Robert Alexander
Surgery - Plastics
1 doctor agrees

In brief: 20-30% reduction

Usually after a 20-30% reduction, difficulty with eye fatigue and loss of effective night vision is noted.
Believed that excessive hooding to that level forces drivers to lift their head when driving at night, resulting in excessive glare and loss of "gray" colors needed for depth perception. Use of visual field analysis in most eye doctor offices can measure the degree of loss.

In brief: 20-30% reduction

Usually after a 20-30% reduction, difficulty with eye fatigue and loss of effective night vision is noted.
Believed that excessive hooding to that level forces drivers to lift their head when driving at night, resulting in excessive glare and loss of "gray" colors needed for depth perception. Use of visual field analysis in most eye doctor offices can measure the degree of loss.
Dr. Robert Alexander
Dr. Robert Alexander
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