Arcuate scotoma is a type of scotoma extending from the blind spot and arching into the nasal field following the lines of retinal nerve fibers.
- An arcuate scotoma may be relative or absolute.
- In the temporal portion of the field, it is narrow because all of the nerve fiber bundles converge onto the optic nerve.
- The scotoma spreads out on the nasal side and may be very wide along the horizontal meridian.
If there is an arcuate scotoma there must be a notch.
- Optic disc drusen
- Ischaemic optic neuropathy
- Optic canal
- Infiltrative, meningioma, demyelination, inflammatory mass
Generally an MRI will be helpful (contrast, fat suppression, T1).