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 with an aura is called a classic migraine (headache with some peculiar visual warning / episode prior to headache)
Migraines are common and typically require no treatment, except for more rest, less stress, etc. Sometimes caffeine can help shorten the episode. Since this is occuring more often, you need to see your doc for consideration of prescription medication for the control of migraines. I hope this helps answer your question, if not, just let me know, Regards