So I was doing some research around the different kinds of conditions people face and what designers can do to ensure accessibility for them. I found some really good material at WebAIM.org.
This page about low vision talks about various conditions people face with limited vision. One such condition is Macular degeneration.
As per the site:
The macula is near the center of the retina, which is the area in the back of the eye. The aging process and the thinning of the tissues of the macula cause the most common form of macular degeneration,"dry" macular degeneration. The result is a gradual loss of vision. "Wet" macular degeneration occurs when abnormal blood vessels at the back of the eye begin to leak fluid or blood and blur central vision, often resulting in rapid loss of vision. In either case, the person's central area of sight is affected the most, making it difficult to see objects that the person is looking at directly. The images below are a simulation of the effect of macular degeneration. Text can appear broken and unclear.
From what I understand, everything a person focuses on, would be blocked as it's the very center of focus that's affected. If this is the case, what would be some measures a designer could take to ensure proper usability?
I tried looking around but could not find anything specific to this condition.
I'm actually researching specifically for data visualization, but in this case am open to generic answers as well.