Zollner and Poggendorff illusions in children with ophthalmopathology. S Rychkova, A Bolshakov |
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IITP Russ Acad Sci, Russian Federation
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| In the previous research (Ninio and O'Regan, 1999 Perception 28 949-964) the characterisation of the misalignement and misangulation components in the Poggendorff and corner-Poggendorff illusions were studied in adult subjects with normal vision. The aim of our study was to compare age dynamics of the perception of the Zollner and classic Poggendorff illusions in children with ophthalmopathology. In total, 141 subjects aged 8-11 yrs (55 subjects), 12-14 yrs (47 subjects) and 15-18 (39 subjects) with various visual impairments (optic nerve atrophy, amblyopia, retinopathy, high myopia, astigmatism, nystagmus) were tested. The control group consisted of 17 subjects aged 16-18 yrs without ophthalmopathology. Using a nulling method, we measured the misalignement components in the Zollner and Poggendorf illusions varying stimulus orientation. The estimates of both illusions were minimal (0,5±0,04o) at the horizontal and vertical orientations, having peaks (9,1±0,09o) at the oblique orientations. We did not find significant differences in the characteristics of the illusions between different age groups and between the children with the congenital low visual acuity (0,18±0,04 decimal units) and the children with relatively high visual acuity (0,75±0,08 decimal unit) as well. Meanwhile, the severity of illusions in all three age groups with ophthalmopathology was greater than in control subjects. |
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