The majority of round glasses on the market right now are big shades that are supposed to look glamorous. Often, they cover at least half the face, and they are designed to stop people from being able to see what lies behind those shades. They are oversized, very fashionable and they are most often for ladies.
There are some round or oval options for men but they are smaller in size, and they’re a look that has to grow on you. Round glasses are best for people with very square faces because they help balance out the features without making people look too blocky in the jaw.