Interesting question, Roman.
I have never encountered any problems in this respect, although I have done thousands of tests and once even had a respondent with a glass eye 😉.
I guess the incidence in the normal samples is generally too low, so one would have to specially sample this target group, to generalise the findings.
I never heard of a study like that, but maybe somebody else knows more? I will also ask the question in my Moodle group.
Cheers,
Juergen
www.eye-tracking-research.org
-----Original Message-----
From: Eye-movement mailing list <[log in to unmask]> On Behalf Of Roman Bednarik
Sent: Mittwoch, 28. Februar 2024 06:28
To: [log in to unmask]
Subject: [EM_LIST] Eye/refractive surgery effects on eye tracking
Dear all
is there any literature that would support the following excerpt of the book that claims: "Reports have been made that laser surgery can leave tiny scars that introduce spurious corneal reflections. We have also seen how it affects data quality, but our studies had far too few participants with laser surgery to generalize. Replications are needed before we can know how large the effect is.” (p. 140, 2nd ed)
Thank you for all and any pointers!
cheers
—Roman
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