Corrective lenses for Tobii Glasses X — Glasses X studies with participants who wear glasses

A kit of slide-on lenses for the Tobii Glasses X wearable eye tracker. The participant takes off their own glasses for the recording, and you slide lenses of their strength onto the Glasses X frame — separately for the left and right eye. They see clearly, and you record data without vision loss.

Request a quote Which lens?

−6 to +3 dptnearsightedness and farsightedness

12 strengthsfor each eye

24 lenses12 for the right and 12 for the left eye

445 gthe complete kit in its case

A consumer study participant wearing Tobii Glasses X eye tracking glasses looks at packaging in a store

Tobii Glasses X
in-store study · lenses slide onto the frame

What corrective lenses are for

Participants who wear glasses stay in the study

Glasses X are worn like ordinary glasses: cameras in the frame track the eyes, and a front-facing camera records what the participant sees. Anyone who normally wears corrective glasses takes them off for the recording — so without correction they would see the shelf, the screen or the road out of focus.

The lens kit solves this simply: you slide lenses of the participant's strength onto the Glasses X frame, separately for each eye.

According to Tobii, the kit extends Glasses X accessibility to people with common nearsightedness and farsightedness.
The lenses let you record data without vision loss.
Designed with participant comfort and measurement accuracy in mind.

Tobii Glasses X eye tracking glasses with slide-on corrective lenses — front view

Lenses slide onto the frame from the side · slide-on

Which lens?

12 strengths in the case — find the lens for your participant

The kit contains 12 strengths, from −6.0 to +3.0 diopters, each in two pieces: for the left and right eye. Set the participant's refractive error, and the photo of the case shows which row to take the lenses from.

Open case of the Tobii Glasses X kit — 24 lenses in two columns, left (L) and right (R), labeled with strengths from −6.0 to +3.0; space for glasses next to them

Participant's refractive error−3.0 dpt

Lenses −3.0 — left and rightThis strength is in the kit. Start with it and check sharpness with the vision testing card.

−6.0−5.0−4.0−3.0−2.5−2.0−1.5−1.0+1.0+1.5+2.0+3.0

Photo: Tobii. Strengths according to the “Tobii Glasses X Corrective Lens Kit” page (tobii.com), as of 2026-10. The prescription is the starting point — you determine the final strength with the test from Tobii's guide (below).

How to choose and fit

Five steps from Tobii's guide

Tobii provides a fitting guide with the kit. You carry out the whole procedure on site, where the study takes place.

Starting point
Ask about the strength of the participant's glasses. If they don't know it: for nearsightedness (distant objects blurry), start at −1.0; for farsightedness (near objects blurry), start at +1.0.
Slide the lenses on
Slide the lens onto the frame until each clip sits flush against the glasses. Check that it is seated evenly — an incorrectly fitted lens impairs the data.
Cover one eye
The participant reads a row of letters on a vision testing card held at the distance of the study objects — from 1.2 to 4.5 m.
Adjust the strength
If they read with difficulty — a stronger lens by 1.0. If they can almost read the row — by 0.5. The strength is printed on the side of the lens.
The other eye
Repeat the test for the other eye. To remove a lens, gently grip the upper and lower clip and slide it off sideways.

A vision testing card is not included in the Glasses X kit. Tobii's guide assumes you prepare your own — we'll advise you which one.

Source: Tobii Glasses X Corrective Lenses — Fitting Guide (v1.0, 2025).

Lenses with Interlab

Glasses X ready for every participant

When recruiting for a field study, you rarely know in advance how many people will come in glasses. We help you prepare the setup so that no one has to be turned away.

Ask about the lens kit

Strength range vs. your participantsWe'll check whether 12 strengths from −6 to +3 dpt are enough for your group — and what to do if they aren't.
A complete field kitTobii Glasses X, corrective lenses and the sunglass clip-on — in one quote.
Training in participant preparationLens selection, putting on the glasses and calibration — as part of the Glasses X implementation.
Demo before you buyWe'll show Glasses X with lenses live, in your study scenario.
Authorized Tobii partnerAn official sales channel for Tobii glasses and accessories.
Local support in PolandTechnical and methodological support after purchase — without intermediaries.

Specifications

Kit specifications

According to Tobii's product page and guide.

Specifications of the corrective lens kit for Tobii Glasses X
Parameter	Value
Lenses
Purpose	correcting the study participant's nearsightedness and farsightedness
Strength range	−6.0 to +3.0 dpt
Strengths	−6.0; −5.0; −4.0; −3.0; −2.5; −2.0; −1.5; −1.0; +1.0; +1.5; +2.0; +3.0
Number of lenses	24 — 12 for the right eye, 12 for the left
Material	optical-grade plastic with hard coating
Mounting	slide-on — until the clips sit flush against the frame
Marking	strength printed on the side of the lens and labeled in the case
Kit
Contents	lenses, cleaning cloth, carrying case with foam insert
Vision testing card	not included
Dimensions (H × W × D)	280 × 180 × 70 mm
Weight (complete kit)	445 g
Compatibility	Tobii Glasses X

Tobii Glasses X with corrective lenses — Glasses X with slide-on lenses fitted.

Working with Tobii Pro Glasses 3?There is a separate kit for Pro Glasses 3: 44 snap-on lenses, from −8.0 to +3.0 dpt in 0.5 steps.
Lenses for Pro Glasses 3 →

Source: tobii.com — “Tobii Glasses X Corrective Lens Kit”; Tobii Glasses X Corrective Lenses — Fitting Guide; as of 2026-10.

Frequently asked questions

The participant's prescription strength isn't in the kit. What then?

The kit has 12 selected strengths, so −3.5 or −4.5, for example, are not included. According to Tobii's guide, the prescription is only the starting point — you choose the right lens with the vision card test, changing the strength in 1.0 and finally 0.5 steps, separately for each eye.

Does this kit fit Tobii Pro Glasses 3?

This kit is for Glasses X, with slide-on lenses. For Pro Glasses 3, Tobii offers a separate kit — 44 snap-on lenses, from −8.0 to +3.0 dpt in 0.5 steps.

Do the lenses correct astigmatism?

Tobii describes the kit as correcting common nearsightedness and farsightedness and does not mention astigmatism correction. If your participant group includes people with astigmatism, ask us — we'll check with the manufacturer.

Do I need a vision testing card?

Yes — the fitting guide assumes a card test at the distance of the study objects (1.2–4.5 m), and the Glasses X kit does not include a card. We'll advise you which one to prepare.

Are the lenses included with the glasses?

They are a separate Tobii accessory. We include them in a quote together with Glasses X or as an addition to glasses you already have.