I was talking to my sister about this the other day. Most frames are made for people with high nose bridges. My face is quite flat so most glasses don't sit on my nose at all, they just rest on my face and so always slide down.
@abadesi That is so true. There needs to be more diversity in the research that goes into the eyewear industry. I know Warby Parker has Low Bridge Fit frames. However, I use Nerdwax on my glasses to make sure they don't slide down.