Look for UV protection (UV400 or 100% UVA/UVB), a comfortable fit, and lenses that suit your typical lighting. Also check that the frame width and bridge fit your face for all-day wear.

Key attributes to compare are protection (UV), lens type (polarized vs non-polarized), frame size and shape, material/weight, and price or brand value.

For specific activities, add polarized lenses to reduce glare, choose lens tint for color accuracy or contrast, and look for coatings like anti-scratch or anti-reflective along with comfortable nose pads.

Choose a frame size that fits most faces, a versatile lens color that works with many outfits, and lightweight materials for all-day comfort. If glare is a concern, consider polarized lenses.