I think she had an attack of Stoke which had affected her eyes.If the bleed or clot affects the Occipital Lobe(back Portion) of the brain, vision will be affected.
Most strokes are ischemic (usually due to blockage of an artery
), but some are hemorrhagic (due to rupture of an artery).
Transient ischemic attacks resemble ischemic strokes except the symptoms resolve within 1 hour.
Recovery after a stroke depends on many factors, such as the location and amount of damage, the person's age, and the presence of other disorders.
Controlling high blood pressure
, high cholesterol
levels, and high blood sugar levels help prevent strokes.
Treatment may include drugs to make blood less likely to clot or to break up clots and sometimes surgery.Lenses, special prisms and Optometric Vision Therapy/Orthoptics are often combined to restore Vision.
I hope this will help