It takes place in modern times, in the US. I was thinking Retinitis Pigmentosa because night blindness figures into the story plot in a big way, but IDK. I've tried googling "night blindness" and "retinitis pigmentosa" but haven't found much on the day to day living and the progression of RP.
Is there any medical treatment for RP, effective or otherwise? How long before the night blindness progresses into vision loss during the day? The disease doesn't have to be specifically named in the story, but I'd still like to get the details right. If someone out there more knowledgeable knows of an eye disease that would better suit my purposes, pls feel free to suggest it.
*edited to add what I've already searched for, "retinitis pigmentosa" "night blindness" "retinitis pigmentosa treatment" "progressive vision loss" "retinitis pigmentosa prognosis"