Am I supposed to see a special consultant opthalmologist for visual field defects?

Optimitrist & Eye MD. 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.
No. Most ophthalmologists have visual field testing devices in their office which can measure a field of vision for most pathologies. There is not a special "consultant" ophthalmologist for this purpose as the interpretation of visual fields is well studied and well known to ophthalmologists.