The term ocular migraine was once used to describe migraine episodes with visual disturbances. While it's sometimes used interchangeably with the term retinal migraine, ocular migraine is actually an umbrella term for both retinal migraine and migraine with aura.
A retinal migraine causes symptoms in one eye only, which can sometimes include temporary vision loss. While migraine with aura also causes visual disturbances, it affects both eyes at the same time.