Hi My Fiance Haf A Stroke About A7 Months Ago

Hi my fiance haf a stroke about a7 months ago which cause him to go blind every now an again he has flashes that allow him to see clear for about a few seconds whats the next step do we need to take in order for use to try an help him get his eyesight restored can sumbody please help he is depressed all the time cause he went from being able to see to only being able to see in flashes for a few seconds