Perfect-fitting sunglasses should do more than just look good – they need to feel right and protect your eyes properly. Finding that ideal pair means they’ll rest comfortably on your nose without sliding, stay in place when you move, and complement your face perfectly. Keep reading to find out how to select sunglasses that you’ll reach for again and again.
What Are the Key Measurements for Sunglasses Sizing?
- Frame Width (Total Width)
Where to look:
Look for a number following the ⬌ symbol or the letters “FW” printed on the inside of the temple arm. If not marked, this measurement spans from the outermost point of one hinge to the other.
What size is right for you:
- 120-130mm: Ideal for narrow faces
- 130-140mm: Suits medium faces
- 140-150mm: Best for wider faces
The frame should extend just slightly beyond your face’s edges – about 2-3mm on each side for optimal fit.
- Lens Width
Where to find it:
The first number in the standard eyewear measurements (eg: 52-18-140) is stamped on the inner temple arm. Sometimes marked with a ⌀ symbol.
Finding your perfect fit:
- 46-49mm: Narrow/petite faces
- 49-54mm: Medium faces
- 54-58mm: Wider faces
Pro tip: Your pupils should sit centered within each lens for proper optical alignment and best vision.
- Bridge Size
How to find it:
The middle number in the standard measurements (52-18-140) on the temple arm, is sometimes marked with a □ symbol. This measures the gap between lenses where they rest on your nose.
Typical sizes:
- 14-16mm: Narrow nose bridges
- 16-18mm: Average nose bridges
- 18-20mm: Wide nose bridges
The bridge should rest comfortably without leaving red marks or sliding down.
- Temple Length
Check the length:
The last number in the standard measurements (52-18-140), is often marked with a — symbol. Measures from hinge to temple tip.
Standard lengths and fit guide:
- 135mm: Most common length
- 140mm: For larger heads
- 145-150mm: Extended fit
The temple tip should curve around your ear with minimal pressure – if it barely touches your ear, it’s too short.
- Lens Height
Where to look:
Usually marked as a “B” measurement on technical specs or after a ↕ symbol. Measures from the lowest to highest point of the lens.
Finding your perfect fit:
- 30-35mm: Fashion/casual wear
- 35-40mm: Standard protection
- 40mm+: Maximum coverage/sports
For proper UV protection, lenses should extend from your eyebrow to the top of your cheekbone.
Additional Tip: Most quality sunglasses include a frame measurements card in the case. Keep this for future reference when shopping for new pairs.
How to Find Sunglasses That Flatter Your Faces
Rules of thumb for face shape & size:
- If you have strong cheekbones: Choose frames that are slightly wider than your cheekbones (about 2-4mm wider)
- For a round face: Pick rectangular or angular frames that are no wider than the widest part of your face
- For square faces: Soften angles with round or oval frames that don’t extend past your cheeks
- For heart-shaped faces: Choose frames that are wider at the top and narrower at the bottom
- For oval faces: Most styles work well – just keep frames proportional to face size
How to get the proportions right:
- Top of frames: Should follow but not hide your eyebrows
- Bottom of frames: Should sit just above your cheekbones
- Side edges: Should extend just slightly beyond face width (about 2-3mm on each side)
- Frame thickness: Choose thinner frames for delicate features, thicker frames for stronger features
- Frame weight: Heavier frames look best on larger faces, while lighter frames suit smaller faces
Pro tips:
- Hold a credit card vertically against your face – if your face is wider than the card, opt for wider frames
- Take a selfie wearing different sizes – the right pair will make your face look naturally balanced
- If you can see your temples extending past the frames when looking straight ahead, the frames are too narrow
- Your eyes should sit centered in each lens, with equal space above and below
- When you smile, frames shouldn’t rest on your cheeks or push up
How to Make Sure Your Sunglasses Fit Perfectly – A Step-by-Step Guide
- Your Sunglasses Should Line Up Evenly With Your Eyes
Put the sunglasses on and look in the mirror. They should sit straight across your face – not higher on one side or tilted. Look straight ahead – your eyes should be right in the middle of each lens, not too high or low. When you smile or talk, the frames shouldn’t bump against your cheeks or move around.
- Wear Them Long Enough to Really Know if They’re Comfortable
Don’t just try them on for a quick second. Keep them on for about 10 minutes while you do normal things like walking around or checking your phone. Move your head around normally. This longer test helps you notice if they start sliding down or if any spots become uncomfortable – things you might miss in a quick try-on.
- Check That Nothing Pinches or Hurts
Good sunglasses should feel light and comfortable, almost like you’re not wearing them. The nosepiece shouldn’t leave red marks. The sides shouldn’t squeeze your head or give you a headache. The parts that go over your ears should rest gently without digging in. When you talk or make expressions, the frames shouldn’t press into your face or rub against your eyebrows.
- Your Sunglasses Should Stay Put When You Move
Try some quick movements to make sure your sunglasses stay in place. Shake your head no, nod yes, and bend down like you’re picking up something. Even try a little jump. If they slide around or fall off during these normal movements, they either need to be adjusted or might not be right for you.
- You Should See Clearly All Around
Look left and right – you should still see everything clearly on the sides. Look up and down to make sure there aren’t gaps where the sun can get in. Step into bright light to check if they block the sun well. Your vision should be clear without any weird reflections or dark spots blocking your view.
- Simple Fixes You Can Try at Home
You can make small adjustments yourself, but be careful. If your sunglasses have nose pads, you can gently push them closer together or pull them apart. The arms can be carefully bent to fit your head better. If they’re slightly crooked, you can carefully adjust the front to make them straight. Just make tiny adjustments – if it feels like you’re forcing it, stop and get professional help.
How to Choose Sunglasses That Work Best for You
Choose Sunglasses That Fit Your Daily Routine
- For Active People: Think about sports sunglasses with wrap-around designs – they curve slightly around your face and stay secure. For example, athletic frames with rubber nose pads and temple grips are perfect for running or tennis. When you’re mountain biking or playing beach volleyball, you’ll want lightweight frames with wide temple arms that block side glare and don’t bounce when you move.
- For Everyday Wear: Consider classic square frames or trendy oversized shapes for daily activities. These work great for driving to work or lunch with friends. Rectangular frames with subtle curves or butterfly shapes offer excellent coverage while keeping you stylish. They’re perfect for weekend shopping or outdoor cafés where you want both protection and style.
Which Frame Material is Best for You?
- Metal Frames: Classic aviator or thin rectangular shapes show off what metal does best. These lightweight frames often have adjustable nose pads – perfect for long days of wear. Thin round metal frames are especially good for those who want a minimalist look while keeping comfort in mind.
- Plastic Frames: Think chunky rectangular shapes or bold cat-eye designs. These frames can handle being tossed in your beach bag without worry. Square or round thick-rimmed styles often last longer and maintain their shape well, even with daily use. They’re excellent for making a style statement while staying durable.
- Flexible Materials: Look for frames advertising “memory metal” or “flexible titanium.” These modern materials allow for rimless or semi-rimless designs that can be twisted and bent without breaking. They’re perfect if you’ve had problems with frames breaking easily or if you often put your sunglasses through tough conditions.
How to Make Sure Your Sunglasses Feel Great All Day
- Short-Term Wear: Oversized butterfly shapes or decorative cat-eye frames work well for short outings. These statement pieces might be heavier but are perfect for a few hours at an outdoor event or lunch date.
- All-Day Comfort: For long road trips or full days outdoors, try lightweight rectangular or subtle oval shapes. Look for frames with spring hinges and adjustable nose pads – they stay comfortable even after 12 hours of wear. Modified aviator styles with lightweight materials are also great for extended wear.
Need Prescription Sunglasses? Start Here
For stronger prescriptions, look for frames with sturdy rectangular shapes and adequate lens depth. Medium-sized square frames of prescription sunglasses often work well with progressive lenses since they provide enough vertical space. Semi-rimless styles can be good for lighter prescriptions while keeping a sleek look.
Finding Your Perfect Sunglasses
Finding great sunglasses doesn’t have to be complicated. Looking for a reliable place to start your search? Lensmart offers a wide range of sunglasses perfect for any occasion – from everyday wear to driving to outdoor activities. Take time to measure your face and consider how you’ll use them – whether for sports, driving, or daily activities. It’s worth trying them on properly: check the fit across your face, make sure they’re centered on your nose, and see how they feel when you move around.
Don’t settle for sunglasses that just look good – find a pair of sunglasses that feels great, protects your eyes, and matches your personal style.