Dial-up, so I can't watch videos. My cat has a seizure disorder, and when she has a bad one, she will yowl and send me running to her side. They pass in short order, and are nearly 100% controlled with meds. Have you talked to your vet about this?
Animals who are living in the same place adjust to blindness as their vision fails. I would not neccessarily make a cause-effect leap between the two. Seven months is a long time for a symptom to last without being evaluated.