> For the complete documentation index, see [llms.txt](https://engle-lab.gitbook.io/lab-manual/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://engle-lab.gitbook.io/lab-manual/study-protocols/eye-tracker-calibration.md).

# Eye Tracker Calibration

{% stepper %}
{% step %}

## **Initial Setup**

The first screen will display two white circles in a black box; these represent the participant’s eyes.

* Ensure the distance shown at the bottom of the box is between <mark style="color:blue;">**60–70 cm**</mark>.
* Instruct the participant to sit comfortably and move their chair forward/backward to reach the correct distance. Do not move the monitor forward/backwards.
  {% endstep %}

{% step %}

## **Eye Detection**

Wait until the eye tracker detects both eyes.&#x20;

* Inform the participant that on the next screen, a red dot will appear, which they should follow with their eyes. Have them press "Enter" to begin.
* Avoid looking at the eye tracker during this step.
  {% endstep %}

{% step %}

## **Calibration Check**

The next screen will display white circles, each with green lines or dots.

* Confirm that each circle contains a green line or dot, and that no lines extend outside the circles.
* If calibration looks good, select **“**&#x41;ccep&#x74;**”** to start the task. If not, choose **“**&#x52;ecalibrat&#x65;**”** and repeat the process.

<div><figure><img src="https://1783073691-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FXc1cErLYtkyOjWlG5P3Z%2Fuploads%2FViihHdFFGo23NiS4wJwr%2FIMG_4833.jpg?alt=media&amp;token=a23ae7f6-24a3-4812-9d77-1e672f7a3476" alt="" width="375"><figcaption></figcaption></figure> <figure><img src="https://1783073691-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FXc1cErLYtkyOjWlG5P3Z%2Fuploads%2FuwRRZZhc7alOaoKgW9LT%2FIMG_4834.jpg?alt=media&amp;token=c8b8d0a6-a876-4a97-a46f-d45cf8dd078a" alt="" width="375"><figcaption></figcaption></figure></div>
{% endstep %}
{% endstepper %}

{% hint style="warning" %}
If you are unable to achieve a good calibration after a few attempts, proceed with the task and **make note in the log book**.
{% endhint %}