It's not like she forgets her glasses all the time. Just a few chapters ago Komura said that she brings her glasses most of the time. It's just that the mangaka skips all of the days where she doesn't need Komuras help.
@Gazz91
Kinda like how when your driving home you hear about the 3 car crashes and not the 30,000 other people who made it home safely without an incident.
@Gazz91 @Wnf
Or like when the Scooby Gang arent hunting monsters. It's not like they live and breathe mysteries, they probably have days off, vacations away from each other, and like everyone else in any tv series, probably go to the bathroom.