Which varifocal upgrades are worth paying for

Corridor length, index and coatings are real. 'Digital', 'HD' and most brand tiers are not. What actually changes what you see.

A varifocal quote can run from £145 to £600 in the same practice for the same prescription. Some of that difference is optics and some of it is marketing. Here is which is which.

Worth paying for

Corridor length matched to the frame. The corridor is the channel of gradually increasing power between distance and reading. In a shallow frame a long corridor gets cut off at the bottom, so you lose the reading zone entirely. This is the single measurement that decides whether you get on with the lens.

Index, above about ±4.00 D. A thinner material genuinely makes a heavy prescription wearable. Below that it mostly buys weight you were not carrying anyway.

Anti-reflection coating, if you drive at night. Fewer internal reflections is a real reduction in the halo around oncoming headlights.

Not worth paying for

Tier names. “Premium”, “Elite” and “HD” are catalogue positions, not measurements. Ask what physically differs and you should get an answer in millimetres or dioptres; if you get an adjective, you are buying the adjective.

Blue-light filtering, for most people. The evidence that it helps eye strain or sleep is thin. If your eyes hurt at a screen, the usual causes are an out-of-date prescription, a dry eye, or a monitor at the wrong height.

Photochromics, if you mostly drive. They do not darken properly behind a windscreen, because the glass blocks the ultraviolet that triggers them.

What we do here

We quote by corridor length and index, list the coating separately, and say plainly when the cheaper lens does the same job. If a £145 pair is right for you, that is what goes on the order.