How to Choose Sunglasses: A Complete Buyer’s Guide

The right pair of sunglasses does two jobs at once. It protects your eyes from the sun, and it helps you look and feel like yourself on a bright day. Get both right, and you will reach for them every time you step outside.

With so many shapes, lens types and tints to choose from, it can feel harder than it should. This guide walks you through what actually matters, from genuine UV protection to the frame shape that suits your face, so you can buy with confidence rather than guesswork.

At Perspective Optometrists in Belsize Park, we help people across Hampstead, Primrose Hill and Camden find sunglasses that protect their eyes and flatter their face. Here is how to make the choice an easy one.

Sunglasses lens features at a glance

Start with the one feature that is non-negotiable: UV protection

Before style, before tint, before anything else, check that your sunglasses block UV light. This is the part that protects your long-term eye health.

The sun gives off ultraviolet light, and over many years, that exposure has been linked to eye conditions, including cataracts, with a possible link to age-related macular degeneration as well. Good sunglasses reduce how much UV reaches your eyes, which is why they matter in every season, not only on holiday. These are also exactly the conditions a thorough eye examination is designed to pick up early, so protecting your eyes outdoors and keeping your eye tests up to date go hand in hand.

Here is the part many people get wrong. A darker lens does not mean more protection. Tint and UV filtering are two different things, and a very dark lens with no UV filter can actually be worse for you, because it makes your pupils open wider and lets more UV in.

So what should you look for? In the UK, check for the CE mark or the British Standard BS EN ISO 12312-1:2013. Either tells you the sunglasses meet a recognised safety standard for UV protection. A label promising 100 percent UVA and UVB protection, or UV400, tells you the same thing. You can read more in the College of Optometrists’ guidance on choosing sunglasses.

One more thing worth knowing: polarisation on its own is not UV protection. Many polarised lenses include a UV filter too, but it is always worth confirming both are present. If you are ever unsure about a pair you already own, bring them in, and we can talk you through whether they are still doing their job.

Choosing a frame shape that suits your face

The most flattering sunglasses tend to balance your features rather than echo them. As a simple starting point, softer, rounder frames complement angular faces, while stronger, more structured frames suit rounder faces.

A few classic shapes to consider:

• Aviator: sleek teardrop lenses and a slim metal frame. A timeless look that suits most faces.
• Wayfarer: bold, sturdy and versatile, easy to wear with round, oval and heart-shaped faces.
• Cat-eye: an upswept frame with vintage charm, especially flattering on square and heart-shaped faces.
• Round: relaxed and characterful, a lovely contrast to angular or square features.

The same principles that guide your everyday glasses apply here, too. If you would like to go deeper into shape and colour, our guide to choosing the perfect frame colour for your skin tone and hair is a useful next read. And to see the kind of independent, design-led frames we are drawn to, take a look at our frames range.

Frame materials and what they mean for you

Material affects how your sunglasses feel, how long they last and how they sit on your face.

• Acetate and plastic: lightweight, comfortable and available in a wonderful range of colours and finishes.
• Metal, including titanium: strong, slim and elegant, with titanium offering excellent durability for very little weight.
• Natural materials such as wood: distinctive and characterful for something a little different.

At Perspective, we favour independent brands that take real care over materials and craft, names like SALT and Anne et Valentin, where quality is something you can feel the moment you put them on.

Lens technologies that change how you see

Beyond UV protection, a few lens options can genuinely improve your comfort outdoors.

• Polarised lenses cut the harsh glare that bounces off water, wet roads and snow. The result is a clearer, more relaxed vision, which is why so many drivers and water lovers swear by them.
• Photochromic lenses adjust their tint to the light around you, darkening in bright sun and clearing as it fades. They are ideal if you would rather not switch between pairs throughout the day.
• Gradient lenses are darker at the top and lighter at the bottom. They shade your eyes from overhead sun while keeping the view ahead clear, which makes them a popular choice for driving and city wear.

Do polarised lenses block UV?

Not on their own. Polarisation reduces glare, but it is a separate feature from UV filtering. Most polarised sunglasses include UV protection as well, so check the label confirms both, or look for the CE mark or a UV400 rating.

Lens tints for different activities

Tint colour is not just cosmetic. It changes contrast and how you perceive the world, so the right one depends on what you love doing.

• Grey keeps colours looking natural and reduces overall brightness, a great all-rounder for everyday sun.
• Brown and amber: lift contrast and depth, helpful on overcast days and in variable light.
• Yellow and orange: sharpen contrast in low light, useful in haze or fog.
• Green balances colour and contrast while easing glare, well-suited to open outdoor spaces.

If you ski, run, cycle or spend time on the water, mention it when you visit. The ideal tint for the slopes is rarely the ideal tint for a city commute, and we are happy to point you towards what will serve you best.

What lens colour is best for driving?

Grey and brown lenses are usually best for driving. They cut brightness without distorting colours, so traffic lights and road signs still read clearly. A gradient tint helps too, shading the sky while keeping your dashboard visible, and polarised lenses reduce glare from wet roads.

Getting the fit right

Even the most beautiful sunglasses disappoint if they do not fit. A good fit keeps them comfortable, secure and effective at blocking light from the sides.

• Width: the frame should sit comfortably across your face without pinching or sliding.
• Bridge: the part that rests on your nose should feel stable and even, with no pressure points.
• Temples: the arms should hold the frame gently in place without gripping behind your ears.
• Coverage: larger or wraparound styles shield more, including from UV that sneaks in around the edges.

This is where popping in really pays off. We can adjust the fit in person so your sunglasses feel right and stay put, whether you are wearing them on the school run or on a sunny terrace.

What about prescription sunglasses?

If you wear glasses, you do not have to choose between seeing clearly and protecting your eyes in the sun. Prescription sunglasses give you both in a single pair, with your prescription built straight into tinted, UV-protective lenses.

They come in single vision and varifocal designs, and you can pair them with polarised or photochromic options depending on how and where you wear them.

Because there is a little more to weigh up with prescription lenses, we have written a dedicated guide. Our ultimate guide to prescription sunglasses walks you through your options in full, from lens types to choosing frames that work with your prescription. You can also browse our full sunglasses range to see the frames we stock, or, if you would like to talk it through in person, our prescription glasses page explains how we approach lenses and fitting at the practice.

Frequently asked questions

Do I really need sunglasses on cloudy days?

Yes. UV light passes through the cloud, so your eyes can still be exposed even when the sky is grey. Wearing UV-protective sunglasses throughout the year is a simple habit that protects your long-term eye health.

Are expensive sunglasses better for my eyes?

Not necessarily. Price reflects materials, brand and design more than protection. What matters most for your eyes is genuine UV filtering, shown by the CE mark, the British Standard, or a 100 percent UV or UV400 label.

Does a darker lens give me more protection?

No. Tint and UV protection are separate. A dark lens without a UV filter can even be worse, because wider pupils let in more UV. Always check for a recognised UV standard rather than judging by how dark the lens looks.

Can I get sunglasses for my child, too?

Yes, and it is a good idea. Children’s eyes are more vulnerable to UV, so good quality, well-fitting sunglasses are a sensible choice. We are always happy to help families across Belsize Park, Hampstead and Primrose Hill find a comfortable pair.

Can you check whether my current sunglasses block UV?

Bring them in, and we can talk you through whether they are offering proper protection and what to look for if you are due for an upgrade.

Find your perfect sunglasses in Belsize Park

Choosing sunglasses comes down to three things: real UV protection, a lens setup that suits how you live, and a frame that fits well and feels like you. Get those right, and the rest is the enjoyable part.

At Perspective Optometrists, our team will help you find a pair that ticks every box, with the unhurried, personal attention we are known for across Belsize Park, Hampstead, Primrose Hill and Camden.