Thanks for writing to us.
From the description provided, it seems you might be having alopecia areata
Alopecia areata is characterised by round patches of hair loss. Sometimes nail changes may be associated with alopecia areata. Brittle nail may also be due to biotin
As far as visual disturbances are concerned these do not correlate with skin problem.
So I would advise that you meet an eye doctor as well as dermatologist
Alopecia areata would respond to steroids
. Biotin supplement would help for nail.