It’s called pupil center shift

Usually due to dry eyes or fatigue. (Sometimes both are hand in hand) .. what you describe truly seems like dry eyes.

Best bet is to figure out source of dry eyes and address. If no improvement, consider a different access method.   I have seen several med interactions that cause this out of the blue, usually related to secretion management.   I would make it the doc aware, see if different med can be used.

Fairly common issue…

-c

Chip Clarke, MS CCC/SLP

Assistive Technology Works, inc.

540.255.4340

SKYPE:  atwclarke

From: <xxxxxx@alsa.simplelists.com> on behalf of Amy Roman <xxxxxx@sbcglobal.net>
Reply-To: "xxxxxx@alsa.simplelists.com" <xxxxxx@alsa.simplelists.com>
Date: Tuesday, October 8, 2019 at 2:35 PM
To: at Listserv <xxxxxx@alsa.simplelists.com>
Subject: Eye Tracker Drift

Hi,

Does anyone have any thoughts on eye tracker drift?  I believe this is the term used when over time, sometimes 5 minutes sometimes more, eye tracking loses its accuracy for a person.  I have a significant number of clients who complain about this and they use different eye trackers.  Does anyone have any ideas or tips for dealing with this or an explanation of what is happening.  I would assume it is eye fatigue but sometimes calibration helps and then 10 minutes later, without having moved, the drift starts again.

Sincerely,

Amy Roman, MS, CCC-SLP
Augmentative Communication Specialist


Forbes Norris ALS Research and Treatment Center
& ALSA Golden West AAC Evaluation Center and Lending Library

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