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Home » Products » Research & Scientific Instruments » Eye Tracking » Corrective lenses

Corrective lenses for Tobii Pro Glasses 3 — Eye tracking studies with participants who wear glasses

A kit of snap-on lenses for the Tobii Pro Glasses 3 wearable eye tracker. A participant who normally wears glasses takes them off for the recording, and you snap lenses of their prescription onto the research glasses — separately for each eye. They see sharply, and you record complete data.

Request a quote How to choose a lens

−8 to +3 dptnearsightedness and farsightedness

0.5 dpt stepsacross the whole range

44 lenses22 for the right and 22 for the left eye

vision card in the caselens selection on site

Corrective lens kit for Tobii Pro Glasses 3 — lenses in the foam insert of the case, each marked with its strength and eye, one lens taken out on top

+1.5 L
strength and eye printed on every lens

A study participant in a store wearing Tobii Pro Glasses 3 eye tracking glasses picks a product from the shelf

Research glasses instead of their owna lens of the participant's strength attached to the frame

What corrective lenses are for

Every participant sees sharply — including those who wear glasses

Eye tracking glasses are worn like ordinary glasses: small cameras in the frame observe the eyes, and a front-facing camera records what the participant sees. A person who normally wears corrective glasses takes them off for the recording — the kit case has a separate compartment for them.

To keep their vision sharp, you attach lenses of their strength to the research glasses, separately for the left and right eye. Tobii designed the kit for the most common refractive errors: nearsightedness and farsightedness.

A broader participant pool

You don't turn away candidates just because they wear glasses — your sample better reflects the population you study.

Sharp vision, complete data

According to Tobii, the lenses let you record data without vision loss — the participant clearly sees the shelf, the screen or the road.

Secure even in motion

The lenses stay securely attached to the glasses even in studies with natural movement, such as sports research.

How to choose a lens

Choosing the strength step by step — following Tobii's guide

Tobii's guide for the kit walks you through it: a starting point from the participant's prescription, a test with the vision testing card, and adjustment in 1.0 and finally 0.5 diopter steps. Try it in the simulation.

Store shelves with jars and bottles — the view the study participant is looking at

Participant's view · illustration

lensnone

BlurryThe participant's refractive error is −3.5 dpt. Attach a lens and change the strength in 1.0 steps.

Participant's refractive error: −3.5 dpt

Change the lens

The simulation simplifies the optics: blur grows with the difference between the refractive error and the lens strength. The strength range matches the Tobii kit: −8.0 to +3.0 dpt in 0.5 steps.

Ask about their glasses
The strength from the participant's prescription is the starting point. If they don't know it: if distant objects look blurry (nearsightedness), start at −1.0; if near objects look blurry (farsightedness), start at +1.0.
Attach the lenses to the glasses
Snap in the inner notch first, then the outer one; remove in the reverse order. A tilted or not fully seated lens impairs the data.
Check with the card
The participant covers one eye and reads a row of letters on the card held at the distance of the study objects (1.2–4.5 m). The card is in the kit case.
Change the strength by 1.0, then by 0.5
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 and labeled in the case.
Repeat for the other eye
There are separate lenses for the left and right eye, so you fit each eye independently.

Source: Tobii Pro Glasses 3 Corrective Lenses — Quick Start Guide.

What's in the case

44 lenses and everything you need to fit them

The kit fits in a single case: the lenses sit in a custom foam insert, each labeled with its strength and eye. The participant puts their own glasses in it for the duration of the recording.

Tobii Pro Glasses 3 frame with a snapped-on −2.5 corrective lens — side view — A lens snapped onto the Pro Glasses 3 frame — strength printed on the side (here −2.5).

22 + 22 lensesfor the right and left eye, −8.0 to +3.0 dpt in 0.5 steps
Vision testing cardfor a sharpness test at the distance of the study objects
Quick start guidestrength selection and lens fitting step by step
Cleaning clothfor cleaning the lenses
Carrying casefoam insert and a compartment for the participant's glasses
Optical-grade plasticlenses with a hard coating

Works with protective lensesYou use the corrective lenses together with Tobii protective lenses — in indoor and outdoor studies.Protective lenses

Working with Tobii Glasses X?For Glasses X, Tobii offers a separate kit with lenses that slide onto the frame.Lenses for Glasses X

Photos: Tobii. Source: tobii.com — “Tobii corrective lenses”; Quick Start Guide; as of 2026-10.

Lenses with Interlab

A kit matched to your glasses and your participant group

The lenses are a small item that decides whether a person who wears glasses can take part in a study. We help you plan them together with the whole setup — before the first participant comes in for a recording.

Ask about the lens kit

Strength range vs. your participantsWe'll check whether the −8 to +3 dpt range covers your group and how to plan for participants who wear glasses.
A complete field kitTobii Pro Glasses 3, corrective lenses and protective lenses — in one quote.
Training in participant preparationLens selection, putting on the glasses and calibration — as part of the Pro Glasses 3 implementation.
Demo before you buyWe'll show the glasses 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.

Lens kit for Tobii Pro Glasses 3 — 44 lenses in the foam insert of the case

Specifications of the corrective lens kit for Tobii Pro Glasses 3
Parameter	Value
Lenses
Purpose	correcting the study participant's nearsightedness and farsightedness
Strength range	−8.0 to +3.0 dpt, in 0.5 dpt steps
Number of lenses	44 — 22 for the right eye, 22 for the left
Material	optical-grade plastic with hard coating
Mounting	snap-on — inner notch first, then the outer one
Marking	strength printed on the side of the lens and labeled in the case
Kit
Contents	lenses, quick start guide, vision testing card, cleaning cloth, carrying case with foam insert and a compartment for the participant's glasses
Dimensions (H × W × D)	80 × 270 × 370 mm
Weight (complete kit)	1250 g
Compatibility	Tobii Pro Glasses 3; can be combined with Tobii protective lenses

Source: tobii.com — “Tobii corrective lenses”; Tobii Pro Glasses 3 Corrective Lenses — Quick Start Guide; as of 2026-10.

Frequently asked questions

Does this kit fit Tobii Glasses X?

This kit is for Pro Glasses 3, with snap-on lenses. For Glasses X, Tobii offers a separate kit with slide-on lenses, from −6.0 to +3.0 dpt.

How do I know which lens to use?

The starting point is the strength of the participant's glasses. Then — following Tobii's guide — the participant covers one eye and reads the card at the distance of the study objects; you change the strength in 1.0 and finally 0.5 diopter steps, separately for each eye. We demonstrate the procedure during training.

Do the lenses correct astigmatism?

Tobii describes the kit as correcting 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.

Can the lenses be combined with protective lenses?

Yes — Tobii states that the corrective lenses can be combined with protective lenses, clear or tinted, for indoor and outdoor studies.

Are the lenses included with the glasses?

They are a separate Tobii accessory. We include them in a quote together with Pro Glasses 3 or as an addition to glasses you already have.