Buying smart glasses in the UK: what actually matters

Smart glasses have been announced, delayed, and announced again for fifteen years. Several products now exist that actually work. This is a short guide to the specifications that matter, the questions worth asking before buying, and what the UK market currently looks like.

Weight

Weight matters more than almost any other specification. A pair of glasses you wear for several hours needs to be comfortable. The relevant range for current AI glasses is roughly 40–75g. Below 50g, most people report forgetting they're wearing them within a few minutes. Above 60g, awareness of the frame becomes a recurring distraction.

Rokid AI Glasses weigh 49g, which places them at the lighter end of the display-based category.

Display brightness

Outdoor readability depends on display brightness. Screens measured in hundreds of nits will wash out in direct sunlight. The practical threshold for outdoor use in British conditions is around 1,000 nits. For reliable readability in summer sunlight, closer to 1,500 nits is needed.

The Rokid display operates at 1,500 nits, which is adequate for most outdoor situations in the UK.

Battery life

Current display-based glasses offer four to eight hours of active use. This is comparable to wireless earbuds, and most people treat them similarly: charge at lunch, use all day. If you need continuous all-day use without access to a charger, check this specification carefully before buying. The Rokid Power Cells add roughly six hours of portable backup if you need to go longer between sockets.

Phone compatibility

Most AI glasses require a companion app and work with both iOS and Android. Check the minimum OS version required. Rokid AI Glasses work with iOS 14 and above, and Android 9 and above — which covers essentially all phones purchased in the last four years.

Prescription support

If you normally wear prescription glasses, confirm before buying whether a prescription lens service is available. Not all manufacturers offer one. SightPhones offers a prescription service for single vision prescriptions. For full details, see Can smart glasses work with prescription lenses?

Warranty and returns in the UK

Electronics sold in the UK carry statutory protection under the Consumer Rights Act 2015. The relevant question is who handles warranty claims — whether you are dealing with a UK-based retailer or with an overseas manufacturer's support team. The difference in practice can be significant.

SightPhones handles warranty and returns directly from the UK, with a one-year manufacturer's warranty and a 30-day return window, no questions asked.

What to ignore

Marketing language about “AI” in this category is often vague. The useful question is not whether a product calls itself AI glasses, but what specific AI features it actually runs: translation, transcription, object recognition, or something else. The more specific the feature description, the more credible the claim.

Where things stand

Display-based AI glasses are genuinely useful for a specific set of people: frequent travellers, those who work in multilingual environments, people who navigate unfamiliar places regularly, and those who want a calmer relationship with information than a smartphone offers.

They are not for everyone yet. The form factor still announces itself as technology rather than disappearing into everyday dress. Battery life is good for half a day. The ecosystem of apps and features is still developing.

But they work. For the right use case, they work quite well.

You can view the Rokid AI Glasses or browse the full range of AI glasses and accessories and order from SightPhones with free UK delivery and 30-day returns. If you have questions before ordering, reach us at support@sightphones.com.