The role of local attentional variations during eccentric view on the development of the preferred retinal locus of fixation

Bernal, Maria Barraza; Nill, Svenja; Rifai, Katharina; Trauzettel‐Klosinski, Susanne; Wahl, Siegfried

doi:10.1167/16.12.419

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“…Alternatively, this reselection of retinal location on the same meridian may also be a consequence of a subject's ability to deploy their attention on some locations of the visual field rather than others. Barraza-Bernal et al, 2016 andBarraza-Bernal, Ivanov, Nill, Rifai, Trauzettel Klosinski, & showed that subjects under simulation of central scotoma tend to develop a peripheral retinal locus of fixation on locations with good attentional performance and that the attentional performance patterns are preserved across the retina. Figure 5.…”

Section: Location Of the Peripheral Locus Of Fixationmentioning

confidence: 99%

The retinal locus of fixation in simulations of progressing central scotomas

2018

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Patients with central scotoma use a preferred retinal locus (PRL) of fixation to perform visual tasks. Some of the conditions that cause central scotoma are progressive, and as a consequence, the PRL needs to be adjusted throughout the progression. The present study investigates the peripheral locus of fixation in subjects under a simulation of progressive central scotoma. Five normally sighted subjects participated in the study. A foveally centered mask of varying size was presented to simulate the scotoma. Initially, subjects developed a peripheral locus of fixation under simulation of a 6° scotoma, which was used as a baseline. The progression was simulated in two separate conditions: a gradual progression and an abrupt progression. In the gradual progression, the diameter of the scotoma increased by a fixed amount of either 1° or 2° of visual angle, thus scotomas of 8°, 10°, and 11° of visual angle were simulated. In the abrupt progression, the diameter was adjusted individually to span the area of the visual field used by the current peripheral locus of fixation. Subjects located the peripheral locus of fixation along the same meridian under simulation of scotoma progression. Furthermore, no differences between the fixation stability of the baseline locus of fixation and the incremental progression locus of fixation were found whereas, in abrupt progression, the fixation stability decreased significantly. These results provide first insight into fixation behavior in a progressive scotoma and may contribute to the development of training tools for patients with progressive central maculopathies.

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Section: Location Of the Peripheral Locus Of Fixationmentioning

confidence: 99%