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Documenta Ophthalmologica

, Volume 56, Issue 4, pp 303–326 | Cite as

Accommodative stimulus/response function in human amblyopia

  • K. J. Ciuffreda
  • S. C. Hokoda
  • G. K. Hung
  • J. L. Semmlow
Article

Abstract

Three parameters are essential to describe static accommodative behavior in a comprehensive, quantitative manner: the slope of the stimulus/response curve, the depth of focus, and the tonic response. These parameters were obtained in amblyopes, former amblyopes, strabismics without amblyopia, and normals. Results showed that the accommodative response in the amblyopic eye was characterized by a reduction in the slope of the stimulus/response curve and increased depth of focus. Similar abnormalities but of lesser magnitude were found in the non-dominant eye of some former amblyopes and some strabismics without amblyopia. Orthoptic therapy always increased the slope of the stimulus/response curve in the amblyopic eye. We believe that the reduced accommodative responses found in amblyopic eyes reflect a primary sensory loss over the central retinal region that occurs as a result of prolonged, early, abnormal visual experience associated with the presence of strabismus and/or anisometropia.

Key words

accommodation amblyopia abnormal visual experience neural plasticity orthoptics strabismus contrast perception modelling neurological control systems 

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Copyright information

© Dr W. Junk Publishers 1984

Authors and Affiliations

  • K. J. Ciuffreda
    • 1
  • S. C. Hokoda
    • 1
  • G. K. Hung
    • 2
  • J. L. Semmlow
    • 2
  1. 1.Amblyopia Laboratory, Department of Vision SciencesState University of New York, State College of OptometryNew YorkUSA
  2. 2.Department of Electrical Engineering, RutgersThe State UniversityPiscatawayUSA

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