Measurement of visual acuity and crowding effect in 3–9-year-old children
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Visual acuity was measured in 140 3–9-year-old children using Landolt’s rins with a gap in one of four orientations. The influence of surrounding additional contours on the detection of orientation of rings of a minimal visible size was studied in the same children, depending on the distance between the rings and the surrounding. The latter consisted of four bands, located symmetrically with reference to the ring. Visual acuity increased with age, reaching the adult level by approximately seven years. A deterioration of the orientation recognition was detected in all children when the surrounding was close to a ring. The distance that caused a perception deterioration decreased with age, reaching the adult level by nine years. The obtained data are discussed from the viewpoint of a possible influence of individual visual areas formed during ontogeny on task performance.
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- 1.Ehlers, H., Clinical Testing of Visual Acuity,A.M.A. Arch. Ophthalmol., 1953, vol. 49, p. 431.Google Scholar
- 2.Flom, M.C., Contour Interaction and the Crowding Effect, inProblems of Optometry, Rutstein, R.P., Ed., 1991, vol. 3, no. 2, p. 237.Google Scholar
- 4.Atkinson, J., Review of Human Visual Development: Crowding and Dyslexia, inVision and Visual Dysfunction, Cronly-Dillon, J.R., Ed., 1991, vol. 13; Vision and Visual Dyslexia, Stein, J.F., Ed., p. 44.Google Scholar
- 6.Nevskaya, A.A., Leushina, L.I., and Bondarko, V.M., The Formation of Visual-Image Thinking in Infants with Vision Defects in the First Year of Their Life.Fiziol. Chel., 1998, vol, 24, no. 3, p. 20.Google Scholar
- 7.Khyuvyarinen, L.,Zrenie u detei: normal’noe i s narusheniyami (Children’s Vision: Normal and Disordered), St. Petersburg: XXI Vek, 1996.Google Scholar
- 8.Vaschenko, D.I., and Rozhkova, G.I., Dynamics of Visual Acuity in Schoolchildren,Perception, 1998, vol. 27, suppl., p. 203.Google Scholar
- 9.Riggs, L.A., Visual Acuity, inVision and Visual Perception, Graham, C.H.,et al., Eds., New York: Wiley, 1965, p. 321.Google Scholar
- 11.Bondarko, V.M. and Danilova, M.V., Influence of Surrounding Stimuli on the Detection of the Orientation of Rectangular Gratings at the Threshold of Resolving Capacity of the Human Visual System,Fiziol. Chel., vol. 24, no. 5, p. 65.Google Scholar
- 12.Bondarko, V.M. and Danilova, M.V., Crowding Effect with Various Surroundings and Distances between Stimuli,Sens. Sist. (Moscow), 1996, vol. 10, no. 1, p. 132.Google Scholar
- 13.Farber, D.A., Semenova, L.K., Alferova, V.V.,et al., Strukturno-funktsional’naya organizatsiya razvivayushchegosya mozga (The Structural-Functional Organization of the Developing Brain), Leningrad: Nauka, 1990.Google Scholar