Vector graphics help a lot, for eye problems
Basically you can zoom in as much as you need with no loss of details.
Existing genealogy apps, were giving me eye strain.
Thats the reason why I wrote Augean
Vector graphics are totally superior, when it comes to enlarging the picture.
For Vector charts, Zoom in/out using Ctrl+Mouse scroll wheel
For 3D charts, Zoom in/out using just the Mouse scroll wheel
A vector based approach, is the best solution for desktop genealogy accessibility.