This is due to the calibration simply being out of alignment. The chase you refer to is also called “Midas Effect.” Midas gets much worse for some individuals when the eye is under strain or dry eyes has impacted performance. Simply
the user starts to look at the cursor because it is not moving with their eye. I speak about this in my trainings often as to the important of the alignment of both the cursor the users eye movement. This can also be eliminated by going with some type of
fixation pointer (collapsing Dot or fixed point) that is only shown when fixating. This opens up another host of issues, but is a good quick fix. Other times, simply increasing the size of the target (letter/symbol) will ease some of the strain. If you
have PCS and you are working in a small physical areas of the screen, Midas can become very apparent and erode the users experience with the device.
Sorry for the short notes.. working on another project right now..
-c
Chip Clarke, MS CCC/SLP
Assistive Technology Works, inc.
540.255.4340
SKYPE: atwclarke
From: <xxxxxx@alsa.simplelists.com> on behalf of Lisa Bardach <xxxxxx@gmail.com>
Reply-To: "xxxxxx@alsa.simplelists.com" <xxxxxx@alsa.simplelists.com>
Date: Tuesday, October 8, 2019 at 2:45 PM
To: "xxxxxx@alsa.simplelists.com" <xxxxxx@alsa.simplelists.com>
Subject: Re: Eye Tracker Drift
I have definitely seen this as well. I also feel that once it starts, it is compounded by people chasing the cursor.
Lisa
On Tue, Oct 8, 2019, 2:35 PM Amy Roman <xxxxxx@sbcglobal.net> wrote: