Human Physiology

, Volume 26, Issue 1, pp 16–20

Measurement of visual acuity and crowding effect in 3–9-year-old children

  • L. A. Semenov
  • N. D. Chernova
  • V. M. Bondarko


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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Copyright information

© MAIK “Nauka/Interperiodica” 2000

Authors and Affiliations

  • L. A. Semenov
    • 1
  • N. D. Chernova
    • 1
  • V. M. Bondarko
    • 1
  1. 1.Pavlov Institute of PhysiologyRussian Academy of SciencesSt. PetersburgRussia

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