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Related Experiment Video

Updated: Jun 18, 2026

Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients
07:06

Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients

Published on: March 29, 2022

Binocular function in school children with reading difficulties.

Catalina Palomo-Alvarez1, María C Puell

  • 1School of Optometry, Complutense University, Madrid, Spain. cpalomoa@fis.ucm.es

Graefe'S Archive for Clinical and Experimental Ophthalmology = Albrecht Von Graefes Archiv Fur Klinische Und Experimentelle Ophthalmologie
|December 5, 2009
PubMed
Summary

Children with poor reading skills, but not dyslexia, showed reduced distance base-in fusional vergence. This highlights the importance of assessing distance vergence ranges in children experiencing reading difficulties.

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Area of Science:

  • Ophthalmology
  • Developmental Psychology
  • Pediatrics

Background:

  • Prior research suggests a link between poor binocular vision and reading difficulties.
  • Limited data exists on the specific binocular abilities of school-aged children with poor reading skills but without dyslexia.

Purpose of the Study:

  • To characterize binocular vision skills in poor-reading children without dyslexia.
  • To assess distance and near horizontal heterophoria, fusional vergence ranges, accommodative convergence/accommodation (AC/A) ratio, near point of convergence (NPC), and stereopsis.

Main Methods:

  • Cross-sectional study of 87 poor readers and 32 controls (ages 8-13) from elementary schools in Madrid.
  • Utilized standard optometric tests including von Graefe, Risley prisms, gradient method, push-up technique, and Randot stereotest.

Related Experiment Videos

Last Updated: Jun 18, 2026

Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients
07:06

Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients

Published on: March 29, 2022

  • Measurements were taken with best spectacle correction.

    • Main Results:

    • Poor readers exhibited significantly lower mean distance base-in break and base-in recovery values compared to controls (p < 0.01).
    • No significant differences were found in distance/near horizontal heterophoria, distance/near horizontal fusional vergence ranges, AC/A ratio, NPC, or stereoacuity.

    Conclusions:

    • This study provides novel data on the binocular vision of children with poor reading skills but no dyslexia.
    • Reduced distance base-in fusional vergence is a key finding.
    • Assessment of distance fusional vergence ranges is recommended for children with reading complaints.