Look for UV protection (UV400), good lens quality, and polarization if you want glare control. Also consider frame size and nose-bridge fit for long-lasting comfort.

Key factors are UV protection (UV400), polarization, lens tint and material, and frame size/fit (face shape and bridge width). Also check frame material for durability and weight.

For driving, polarized lenses with a high-contrast tint help with glare and visibility. For outdoor days, consider impact-resistant lenses and a secure, comfortable fit; for everyday wear, choose a versatile frame and a neutral color.

Square frames can balance round features; choose a size that sits slightly wider than your face and ensure the bridge and temples fit comfortably.