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1995 Fiscal Year Final Research Report Summary

Objective Visual Accuity Test Using Optokinetic Nystagmus

Research Project

Project/Area Number 05610185
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field Educaion
Research InstitutionUniversity of Tsukuba

Principal Investigator

MAEKAWA Hisao  University of Tsukuba, Instituteof Special Education. Associate Professor, 心身障害学系, 助教授 (50165635)

Co-Investigator(Kenkyū-buntansha) TAKAHASHI Hisako  University of Tsukuba, Instituteof Special Education. Assistant, 心身障害学系, 助手 (70261766)
SASHIMA Tsuyoshi  University of Tsukuba, Instituteof Special Education. Assistant, 心身障害学系, 助手 (20241763)
Project Period (FY) 1993 – 1995
KeywordsObjective Visual Acuity Test / Optokinetic Nystagmus / Visual Impairment / OKN acuity
Research Abstract

The aim of this research is to examine the possibility of Optokinetic Nystagmus (OKN) as an objective visual acuity test for sever-multiple handicapped children and infants. We measured the OKN of 30 mentally retarded children induced by turning drum. The result appeared to be affected by attention of children or aversive response. Then we examined what conditions need to measure the visual acuity from OKN.How do visual target size and speed affect inducing OKN under normal sighted condition, refractive error condition, opacity condition and visual field defect condition ? Under normal sighted condition, the more thin the target size is, the more slowly the target need to move for OKN to be induced. When the target size is 25', the target speed is 500-750Hz for inducing OKN.But, the target 25' size is 0.04 as visual acuity. So we need two parameters to speculate the visual acuity from OKN.These are target size and speed. Under refractive error and opacity condition, when the target size is thin, we need more slow target speed. In addition to the visual acuity, other visual factors affect the amplitude of OKN and the time of one cycle.
We conclude from this research that OKN is very useful clinical method as visual acuity test for sever-multiple handicapped children. So we need OKN research under various visual handicapped conditions still more.

  • Research Products

    (4 results)

All Other

All Publications (4 results)

  • [Publications] 佐島 毅: "発生障害乳幼児の視機能スクリーニングにおける小児用レフラクトメータPR-2000の有効性の検討" 第42回小児保健学会講演集. 346-347 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 佐島 毅: "教育現場における重複障害児の視力評価" 視覚障害教育実践研究. 8. 28-36 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Tsuyoshi Sashima: "Vision screaning for children with Developmental Disabilities using refractometer (PR-2000)" 42th.Lecture of Padiatric Public Helth. 346-347 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tsuyoshi Sashima: "Educational Evaluation of Visual Acuity for Children with Multiply Handicapped" Educational Research for visual handicapped. Vol, 8. 28-36 (1995)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1997-03-04  

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