Varikuti PhD thesis final.pdf - Anglia Ruskin Research Online

Manny, Fern and Loshin (1987) carried out a similar study to Flom,Weymouth and Kahneman (1963) but in children (2 to 5 years old) withnormal vision. They measured the percentage of correct responses as afunction of separation using a square Landolt C with gap in the C presentedonly in the vertical direction and the gap is flanked by two equally spacedflanking bars ranging from abutting to 8.52 times the gap width(approximately 1.7 times optotype width separation). The maximal intensityof contour interaction was at 0.71 to 1.42 times the gap width(approximately 0.15 – 0.3 optotype width separation). Additionally, 4 out of12 children (3 to 4 years) showed maximum intensity of contour interactionat the abutting condition similar to the findings of some subjects in Flom,Weymouth and Kahneman (1963) data. Manny, Fern and Loshin (1987)suggested that the intensity of contour interaction was nearly the same inchildren and adults, although the findings of other studies that showedgreater extent of contour interaction in children than adults (Atkinson, et al.,1985; 1988; Kothe and Regan, 1990b; Semenov, Chernova and Bondarko,2000; Bondarko and Semenov, 2005; Jeon, Hamid, Maurer and Lewis, 2010).Jacobs (1979) measured visual acuity as a function of separation using aflanked Landolt C with flanking bars ranging from abutting to 5 bar widths(1.0 optotype width separation). Visual acuity was measured in adults with24