Comparing progressive lenses: criteria and limits of equivalence

Two progressive lenses sit at a similar level in the ranges of two different manufacturers. Can they be presented as equivalent? A progressive lens comparison table helps structure the selection, but the decision has to take into account the wearer, the frame and the exact characteristics of each reference.

A higher tier is not "a better lens" for this particular wearer

This is the most common misreading in store. The comparison grid describes a level of customisation — traditional, digital, freeform, individualised — in other words, the number of parameters taken into account in the calculation. It describes neither the intent behind the design, nor the priority viewing distance, nor how the lens behaves during adaptation. Four major differences escape the ranking entirely — and they are found instead in the lens descriptions, which can be displayed directly within the table.

Two lenses on the same tier may target different distances

At Nikon, the Presio Master Yourlife FP is built on Life Adapt technology, which "identifies the zone of the lens you will use most with your eyes during your favourite activities", then optimises the optical surface of that zone. In practice, the same reference is ordered in several variants — Prox, Flex, Max — depending on the priority zone: rather near vision, rather intermediate, or rather distance vision.

These three variants occupy the same cell in the comparison table and do not deliver anything like the same sensation. An active wearer who needs a wide distance field, fitted with Prox because "it is the highest rated", will say exactly what you hear at the first trial: everything looks higher, distance vision feels short, and near vision arrives too quickly as soon as they lower their eyes. The lens is not at fault — the choice of variant is.

The same logic applies elsewhere: the ZEISS DriveSafe progressive claims an intermediate zone up to 43% larger and a distance zone up to 14% larger, to support the back-and-forth between road, dashboard and mirrors. It is a design geared to driving, not a higher tier.

A "boosted" intermediate zone is paid for in distance vision

This is the most discreet trade-off in recent progressives. Many designs conceived for a connected lifestyle widen the intermediate zone — the zone for the screen, the dashboard, the workbench. That surface does not come free: it is taken from the rest of the lens, and most often from the usable width in distance vision.

At HOYA, the Hoyalux iD LifeStyle 4 owns the trade-off by offering three geometries of the same reference: Indoor, "a progressive lens prioritising near vision for reading and the use of digital devices"; Urban, "a balance between near, intermediate and distance vision"; Outdoor, "a progressive lens prioritising distance vision". Same lens, same tier, same price — and three radically different field distributions.

A wearer who drives a great deal fitted with Indoor, or an office-based wearer fitted with Outdoor, will get a lens perfectly compliant with the order and perfectly unsuited to their day. No position in the grid flags this: it is the description of the reference that shows it, and the needs discovery with the client that settles it. The extreme case is already well known: ZEISS Officelens occupational lenses push the intermediate zone to the maximum by giving up distance vision altogether. Screen-oriented progressives do exactly the same thing, more discreetly — they do not give up distance vision, they narrow it. It is a compromise, not a step up in range.

Prism thinning changes between generations and between manufacturers

This is the point that explains most of the "everything looks higher" feedback after a change of supplier. Prism thinning is added to balance the thickness at the top and bottom of the lens; its value is linked to the addition, and the formula differs from one design to another. Older geometries required more of it than recent ones — the documented order of magnitude ranges from around 0.7 × Add on older-generation designs to 0.50 × Add on more aspheric designs. The effect for the wearer: a slight upward shift of the visual field, painless when it is identical in both eyes, disruptive as soon as there is an imbalance.

Manufacturers do not, in fact, handle this parameter the same way. On the Presio Master, Nikon claims a Total Prism Control technology that manages prism thinning differently according to the wearer's refractive error, in order to encourage a natural downward gaze. In other words: a wearer moving from Nikon to ZEISS, or the reverse, may feel a change in image position even though the prescription, the addition and the tier in the comparison table are strictly identical.

Corridor length appears nowhere in the grid

Many designs have historically been limited to two corridors — standard and short — while customised offers make it possible to adjust the corridor length to the frame and to the wearer (the FrameFit option at ZEISS). A wearer used to a long corridor, fitted with a short corridor in a small frame, will feel that near vision "arrives too quickly", and will look for the reading zone higher than usual.

Start with what the client wants to keep

Before comparing brand names, describe the use. What does the client appreciate about their current eyewear? At what distance do they work? In which situations do they report a limitation? This record gives the comparison meaning and avoids reducing the choice to a ranking from cheapest to most expensive.

One question is worth adding for a long-standing wearer: how long have they been wearing the same design? Someone accustomed to an older-generation progressive has built their reference points — head position, gaze height for reading — on a specific geometry. Switching them abruptly to a very different design, even one superior on paper, amounts to asking them to relearn everything. In that case, continuity of design is often a better argument than the tier.

If the current reference is unknown, start with the engraving search. Keep the distinction between a confirmed reference and an identification that is still uncertain.

Compare on the same criteria

ZEISS documentation illustrates in particular the importance of the frame and of the position-of-wear parameters in certain customised offers. To compare two manufacturers, consult the documentation of each: a shared marketing label does not prove that the same measurements go into the calculation.

Use the table as a starting point

1. Identify the range level

   In the Clic-Optic comparison table, locate the reference and the neighbouring proposals. The groupings help you navigate the ranges; they do not constitute a comparative clinical trial.

2. Display the descriptions

   The position in the grid is only the way in. The comparison table lets you display the lens descriptions directly within the table: that is where you find the information a coloured marker cannot carry — available corridors and corridor lengths, claimed technologies, variants by priority distance, parameters taken into account in the calculation.

   This is the step that turns a reading of tiers into a reading of designs. Two references from the same cell, with their descriptions opened side by side, very quickly stop looking alike.

3. Keep a short list

   Choose the alternatives that match the client's situation. For each one, note the benefit being sought and the point still to be confirmed. A reasoned short list is more useful than a long list of references.

4. Check the ordering documentation

   Verify availability and constraints with the manufacturers. Neither a cell in the comparison table nor its description replaces the up-to-date ordering catalogue, and they are not a guarantee of availability. It is on the order form that the chosen variant and the corridor length are confirmed.

5. Present the differences that matter

   Explain what changes for the eyewear project: the parameters considered, the options chosen and any trade-offs. Avoid promising a sensation identical to the previous lens — and avoid just as strongly promising a better sensation on the grounds that the lens is rated higher.

Example: changing supplier without losing the thread

A client who is happy with their progressives renews their frame while the store now works with a different lens manufacturer. The right question is not only "which lens is on the same line?". You also need to go back over the uses, confirm the previous reference and check that the new options are compatible with the chosen frame.

This fictional case shows what the comparison table is for: shortening the search for candidates so that more time can be spent on how relevant they are. The table guides the work; the optician remains responsible for the choice and for explaining it.