I am currently being looked at for possible AS and am already diagnosed with scleroderma (a different systemic autoimmune disease). I have had what I believe are ocular migraines for at least 10-15 years.
I do not know the answer to your question, but I have read that autoimmune conditions may play a role in ocular migraines. I will be curious to see of others with more information respond.
All the Best!
Female, early 50's, HLA B27+, family history of SpA
Diagnoses: USpA (9/17), limited Scleroderma/Raynaud's phenomenon/Sjogren's syndrome (1/16), stroke (8/15), Factor V Leiden (8/15)
AS symptoms: right heel enthesitis; mild low back and hip pain; normal MRI
Treatment: Xarelto; vitamins D3, B6, B12, folate; probiotic