AUTHOR=Kugler Günter , 't Hart Bernard M. , Kohlbecher Stefan , Bartl Klaus , Schumann Frank , Einhäuser Wolfgang , Schneider Erich 

TITLE=Visual Search in the Real World: Color Vision Deficiency Affects Peripheral Guidance, but Leaves Foveal Verification Largely Unaffected

JOURNAL=Frontiers in Human Neuroscience

VOLUME=Volume 9 - 2015

YEAR=2015

URL=https://www.frontiersin.org/journals/human-neuroscience/articles/10.3389/fnhum.2015.00680

DOI=10.3389/fnhum.2015.00680

ISSN=1662-5161

ABSTRACT=Background: People with color vision deficiencies report numerous limitations in daily life. However, they use basic color terms systematically and in a similar manner as people with people with normal color vision. We hypothesize that a possible explanation for this discrepancy between color perception and behavioral consequences might be found in the gaze behavior of people with color vision deficiency.
Methods: A group of participants with color vision deficiencies and a control group performed several search tasks in a naturalistic setting on a lawn.
Results: Search performance was similar in both groups in a color-unrelated search task as well as in a search for yellow targets. While searching for red targets, color vision deficient participants exhibited a strongly degraded performance. This was closely matched by the number of fixations on red objects shown by the two groups. Importantly, once they fixated a target, participants with color vision deficiencies exhibited only few identification errors. 
Conclusions: Participants with color vision deficiencies are not able to enhance their search for red targets on a (green) lawn by an efficient guiding mechanism. The data indicate that the impaired guiding is the main influence on search performance, while foveal identification (verification) largely unaffected.