system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why were monocles used when most cases of vision loss affect both eyes?

I can only assume it's because it was the fashion of the time, but I can't understand why you'd sacrifice clarity in one eye for the sake of looking on top of attitudes and trends.
gpt
They're more like modern reading glasses, you keep the monocle in your front pocket and bring it out to read fine text.

Nobody actually wore them around all day, it just became a symbol of rich old people because that's who would typically have the need for one.