User manual

Figure 3-15. Camera Setup with Subjects Wearing

Glasses (Desktop Mount – Camera Angled).

If the image becomes too dark or too light, wait one second while the auto-

contrast adjusts itself. If the blue thresholded area in the display is interfering

with setup, press the “Threshold Coloring” button (or ‘T’ on the keyboard) to

remove the threshold color overlay. In TRACK.EXE, you can use keys on either

the Display or Host PC to perform all keyboard shortcut operations while the

eye image is displayed.

The camera should be focused by rotating the camera lens. Turn the lens by

placing your thumb on the bottom of the lens and turning the lens holder by

sliding your index finger along the top of the camera (see Figure 3-7). This will

keep your fingers away from the subject's eyes, and prevent the camera image

and eye illumination from being blocked. Look closely at the eye image on the

zoomed view while adjusting the position of the focusing arm until the eye

image is clear. If a yellow circle (CR signal) appears near the pupil, the best

focus will minimize the size this yellow circle.

By default, the “Illuminator Power” level is set to 75% at the recommended

distance. If the Desktop Mount is placed too further away from the observer or

if you find the pupil is not reliably acquired, you may consider increasing the

illumination level to 100%. Now continue with section 3.3 “Setting Pupil

Threshold”.

3.3 Setting Pupil Threshold

The camera image of the eye should now be clear, with the pupil centered when

the subject looks at the eye image on the subject computer's display. The pupil

An EyeLink 1000 Tutorial: Running an Experiment