What would cause episodes of various lines and spots in the vision of one eye? some bright, blurring, others seem to have a hint of various colors

Sounds like: Floaters.Usually not significant but mention them at your next eye exam.If interferes with vision, don't wait to b seen.

See below: You may actually have occular migraine headaches. You should see an opthalmologist.

Ocular migraines!: Ocular migraines are a form of migraines that take place in the occipital cortex (part of the brain that interprets/controls vision). They lack the severe headache as common migraines. The symptoms are usually all or mostly visual and are typically described as flashing of light or ziz-zag lights in the vision. They usually last less than 30 minutes and affect the vision out of both eyes.