I see patients with similar symptoms quite often. Folks often describe a bright or colorful pattern (sometimes wavy or zigzag in nature) and it can be in one eye and moves to the other, sometimes affecting the central vision. Sometimes there is a headache following this as well. This is called an ophthalmic migraine. The names can be confusing. Think of it this way:
only the visual symptoms - no headache = ophthalmic migraine (also known as ocular migraine).
Headache by itself may be a migraine - usually has no visual symptoms
headache with an aura is called a classic migraine (headache with some peculiar visual warning / episode prior to headache)
Ophthalmic migraine is a visual phenomenon and is benign and requires no treatment, except for more rest, less stress, etc. Sometimes caffeine can help shorten the episode. I am glad she is being seen tomorrow, but I dont expect anything serious. I hope this helps answer your question, if not, just let me know, Regards