Why were monocles so popular if they only corrected vision in only

Why do monocles exist, and also how do they stay on? I mean

Through the Looking Glass: The History of Eye Glasses

Monocle's View From Nowhere

Why Wear a Monocle Instead of Glasses

Why don't people wear eyepatches anymore? - Quora

How do monocles work? - Quora

The Monocle — The One-Time Cool Accessory, by 'Tosin Adeoti

The 1901 Monocle – eyeglassdotcom

Who invented Aviator sunglasses? Why were they originally invented