I see you are into mapping sidewalks which is one of my passions. One suggest that can help people with limited eyesight is to add the tactile pad, typically found where the curb is lowered. Though older crossings may not have a valid pad. 
 
I'm part of a group working on pedestrian mapping. Right now the best document we have is on the wiki at https://wiki.openstreetmap.org/wiki/Draft:Foundation/Local_Chapters/United_States/Pedestrian_Working_Group/Schema

We are working on more tools and wiki pages to help. 

Let me know if you are interested in learn more or helping out on our work.
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