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Related Experiment Video

Updated: Mar 7, 2026

The Measurement and Treatment of Suppression in Amblyopia
08:34

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Published on: December 14, 2012

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Interocular suppression in children with deprivation amblyopia.

Lisa Hamm1, Zidong Chen2, Jinrong Li2

  • 1School of Optometry and Vision Science, University of Auckland, New Zealand.

Vision Research
|February 20, 2017
PubMed
Summary

Contrast balancing can help overcome visual suppression in children with amblyopia, particularly those with anisometropic or strabismic types. However, children with deprivation amblyopia due to cataracts show stronger suppression, limiting treatment options.

Keywords:
AmblyopiaChildhood cataractInterocular contrast balanceInterocular suppressionSuppression

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Vision Science

Background:

  • Interocular suppression in amblyopia can be reduced by differential contrast presentation.
  • This suggests a functionally suppressed but structurally intact binocular system.

Purpose of the Study:

  • To investigate if contrast balancing can overcome suppression in children with deprivation amblyopia due to childhood cataracts.
  • To quantify interocular contrast balance using dichoptic global motion technique.

Main Methods:

  • Measured contrast interference thresholds using a dichoptic global motion technique.
  • Studied 21 children with deprivation amblyopia, 14 with anisometropic/strabismic amblyopia, and 10 controls (ages 5-16).

Main Results:

  • Contrast balancing intermittently overcame suppression in most children with deprivation amblyopia and all with anisometropic/strabismic amblyopia.
  • Children with cataract-induced deprivation amblyopia exhibited strong suppression, tolerating only low contrast levels to the stronger eye.

Conclusions:

  • Suppression in deprivation amblyopia can be overcome by contrast balancing in some children.
  • Treatment strategies using contrast-balanced dichoptic presentation may be viable for a subset of these patients.