Frame guide

How to find the right frames online

Finding glasses that fit isn't guesswork. Know a couple of numbers from your current glasses and a few rules of thumb, and you'll get it right without leaving your sofa. And if you don't, we'll swap them for free within 100 days.

Start with your current glasses

The best frame guide is usually already on your nose. If your current glasses feel good, their measurements tell you more than any mirror.

Check the inside of the temple (the arm). There are usually three numbers:

52□18145

52 Lens width. The width of one lens in millimetres.
18 Bridge. The part between the lenses that rests on your nose.
145 Temple length. From the hinge to the end of the arm behind your ear.

The fourth number, total frame width, isn't on the temple. Grab a ruler and measure the front of the frame from one outer edge to the other.

Frame width is measured from outer edge to outer edge

Tip: save the numbers on your phone – you'll need them again.

No old glasses to check? No problem. The Frame Finder can also estimate your size from the width of your face. Find your frames

Choose the right size

Frame width is the single most important measurement. Get it right, and your glasses won't squeeze your head or stick out past your face.

Pick a size based on the width of your current glasses:

XSunder 133 mm S133–137 mm M138–141 mm L142–145 mm XL146 mm or more

Rule of thumb: compare the width of the new frame with your current glasses.

0–3 mm differenceFits almost the same.

4–5 mm differenceYou'll notice it.

Over 5 mm differenceWorth looking at another size.

Every frame's product page has a "Will these frames fit me?" calculator that does the comparison for you.

Two more measurements

Bridge. If your current glasses pinch your nose or keep sliding down, the bridge is probably too narrow or too wide. Stay within a couple of millimetres of a size that feels good. On frames with nose pads, the pads adjust to your nose, so the bridge matters less.
Temple length. A few millimetres either way usually doesn't matter. You can also adjust the temples at home if your glasses slide down or press behind your ears. How to adjust the temples

Shape: your face and your taste

Face-shape rules are a good starting point, but they're not the law. The basic idea is contrast: soft features get some structure from angular frames, and sharp angles soften with round ones.

Round face

Angular, rectangular and cat-eye frames add some definition.

Square face

Round and oval frames soften a strong jaw and defined angles.

Heart-shaped face

Wider forehead, narrow chin. Round, oval and aviator frames balance out the wider forehead.

Oval face

Almost any shape works, so go with whatever you like best.

Two rules that work for almost everyone

Top edge in line with your eyebrows. If your brows sit completely inside the frame or far above it, you can easily end up looking stern or surprised.
Eyes in the middle of the lenses. If your eyes sit close to your nose, the frame is too wide for you.

And most important of all: you'll wear your glasses every day. If a pair makes you smile in the mirror, it's often the right one – whatever the chart says.

Your prescription matters too

This often gets forgotten, even though it makes a big difference to how your finished glasses look and feel.

Minus lens (short-sighted)thicker at the edges, thinner in the middle

Plus lens (long-sighted)thicker in the middle, thinner at the edges

Minus prescription (short-sighted). The lens is thicker at the edges than in the middle. The wider the lens, the thicker the edges and the heavier the glasses. With a strong minus prescription, choose a frame with lenses that aren't very wide and where your eyes sit in the middle of the lens. The thicker rims of plastic and acetate frames also hide the lens edge better than thin metal.
Plus prescription (long-sighted, reading glasses). The lens is thicker in the middle and makes your eyes look a little bigger. A smaller lens stays thinner and lighter.
Rimless frames. The whole edge of the lens is on show, so they look best with low and medium prescriptions.
Progressive lenses. The lens needs room for the distance, intermediate and near zones, so choose a frame whose lenses aren't too shallow. Not sure? Email us at info@banaanieyewear.fi and we'll look at it together.

Thinner lenses

Every frame comes with a thin 1.61 lens included in the price. For stronger prescriptions, you can choose an even thinner one when you pick your lenses. The stronger your prescription, the more difference a thinner lens makes to both the look and the weight.

1.61 thin

included

1.67 extra-thin

+€24

1.74 ultra-thin

+€69

Prices are for single-vision lenses. You'll find progressive lens prices on our pricing page.

Colour

When it comes to colour, trust your own taste. A couple of tips to help:

Black and tortoiseshell

Goes with almost everything and is a safe choice for your first pair.

Clear and light colours

A lighter look that blends in with your face. A good choice if you'd rather your glasses didn't stand out.

Gold, rose gold and silver

Gold and rose gold add warmth, silver and grey cool things down. See which suits your skin and hair better – or match the colour of your jewellery.

Colourful frames

Frames are an accessory too. If you wear glasses every day, a bold colour might be just the thing for your second pair.

Try before you buy

Virtual try-on

Every frame's product page has a "Try on virtually" button. You'll see the frames on your own face through your phone or computer camera – no app needed.

How it works

Frame Finder

Answer a few questions and we'll pick out the frames that suit your measurements and taste – from over 1,300 frames. Takes about a minute.

Find your frames

Browse with filters

Every filter in one place: shape, width, bridge, colour and material.

Browse frames

And if it doesn't work out:

✅ 100-day free returns and exchanges

✅ You can adjust the temples and nose pads at home. Here's how

✅ 2-year warranty

The five most common mistakes (and how to avoid them)

Choosing from the photo alone. In product photos, all frames look the same size. Always compare the width with your current glasses.
Frames that are too wide. Your eyes end up close to your nose, and the thick edge of a minus lens stands out more. Make sure your eyes sit in the middle of the lens.
Big lens, strong prescription. The stronger your prescription, the more a smaller lens or a thinner material lightens your glasses.
Ordering with an old prescription. Check that your prescription is still valid. If it's out of date, get an eye test first.
Typing in your prescription wrong. Upload it as a photo or PDF when you order. We'll read the values for you – and if we read them wrong, that's on us.