Start with UV, then choose for glare and convenience
The most important feature of any sunglasses is UV protection. The American Academy of Ophthalmology recommends lenses labeled 100% UV protection or UV absorption up to 400 nm. Everything else (darkness, color, polarization, mirror coatings) is about comfort and glare. AAO notes that darker or more expensive lenses are not automatically more protective, and that tints and mirror coatings do not add UV protection on their own.
With that settled, the choice comes down to three main lens types.
Tinted, polarized and photochromic compared
| Tinted | Polarized | Photochromic | |
|---|---|---|---|
| How it works | A fixed color that reduces brightness | A filter that blocks horizontally reflected glare | Darkens in UV light, clears indoors |
| Glare from water, roads, snow | Reduces brightness only | Strong glare reduction | Reduces brightness only (polarized versions exist) |
| Indoors | Too dark; need a second pair | Too dark; need a second pair | Clears, so one pair can work |
| In the car | Works | Works well | Darkens little behind most windshields |
| Speed of change | None | None | Several minutes to darken and clear |
| Screens and displays | Usually fine | Some screens can look dim or patchy | Usually fine |
| Good for | Simple, everyday sun use | Driving, boating, fishing, golf | People in and out of buildings all day |
Tinted lenses
A solid or gradient tint reduces brightness. Gray keeps colors closest to natural. Brown and amber add contrast and warmth. Gradient tints are darker on top and lighter below, which helps if you read a phone or dashboard in the sun. Tinted lenses are the simplest option and pair well with almost any prescription.
Polarized lenses
Light bouncing off flat surfaces such as water, wet roads or car hoods becomes glare. Polarized lenses filter it out, which is why they are popular for driving and time near water. Two cautions: some phone screens, car displays and instrument panels can look darker or show patches through polarized lenses, and polarization does not mean UV protection. Look for both.
Photochromic lenses
Photochromic lenses darken when UV light hits them and clear indoors, so one pair can serve as everyday glasses and sunglasses. The tradeoffs:
- In the car, most windshields block much of the UV that triggers darkening, so the lenses stay fairly light. They do not work as sunglasses while driving.
- Timing. Darkening and clearing take several minutes, so expect a lag when you walk indoors.
- Temperature. Many photochromic lenses get darker in cold weather and lighter in heat.
Some photochromic lenses are designed to darken partly behind a windshield; ask about these if driving is your main concern.
Wraparound frames and strong prescriptions
Larger and wraparound frames block more light from the sides, which AAO notes improves protection. With a prescription, though, curve has limits:
- Strongly curved fronts tilt the lens in front of your eye, which can blur or distort vision unless the lens is designed and measured for that curve.
- Higher prescriptions narrow the choices further, especially with astigmatism.
- Progressives need enough lens height and may not be available in every highly curved frame.
An optician can tell you which sun frames will work with your prescription before you fall in love with one.
A quick decision guide
- Mostly driving and outdoor sports near water: polarized
- In and out of buildings all day, with little driving: photochromic
- Simple sun pair, or you use screens outdoors a lot: tinted
- Lots of driving and want one pair: a dedicated sun pair, plus clear everyday glasses
- Any choice: confirm 100% UV protection
Contact lens wearers
Non-prescription sunglasses over contact lenses are an easy alternative. The same rules apply: 100% UV protection first, then polarized or tinted to taste.
A note on safety
All eyeglass and sunglass lenses sold in the U.S. must pass an FDA impact test unless the doctor documents a reason otherwise. That makes them impact-resistant, though any lens can still crack or break under enough force. Regular sunglasses are also not safe for looking at the sun during an eclipse, or for welding or tanning beds.
Next step
Compare tints, polarized and photochromic options on our lens options page, then browse sun styles in frames and collections. Bring your current prescription so an optician can confirm which frames suit it.