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Differences in the Stimulus Accommodative Convergence/Accommodation Ratio using Various Techniques and Accommodative

Tsukasa Satou1, Misae Ito1, Yuma Shinomiya1

  • 1a Department of Orthoptics and Visual Sciences, School of Health Sciences , International University of Health and Welfare , Ohtawara , Tochigi , Japan.

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PubMed
Summary
This summary is machine-generated.

Investigating the stimulus accommodative convergence/accommodation (AC/A) ratio reveals significant differences based on measurement techniques and accommodative stimuli. Using high accommodative stimuli can minimize variations caused by different measurement methods.

Keywords:
AC/A ratioaccommodationconvergencemeasurement methods

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Area of Science:

  • Ophthalmology
  • Optometry
  • Vision Science

Background:

  • The accommodative convergence/accommodation (AC/A) ratio is a crucial measure in understanding binocular vision and diagnosing certain visual dysfunctions.
  • Variations in measurement techniques and accommodative stimuli can influence the obtained AC/A ratio, potentially leading to diagnostic inconsistencies.

Purpose of the Study:

  • To investigate and quantify differences in the stimulus accommodative convergence/accommodation (AC/A) ratio when measured using various techniques and accommodative stimuli.
  • To describe a standardized method for determining the stimulus AC/A ratio.

Main Methods:

  • Eighty-one young adults (mean age 21 years) participated in the study.
  • Ocular deviation was assessed using the alternate prism cover test (method 1) and a major amblyoscope (method 2) under varying accommodative stimuli (up to 10.00 D).
  • Stimulus AC/A ratios were calculated for both low and high accommodation conditions using specific analysis methods.

Main Results:

  • Significant differences were observed in the median stimulus AC/A ratio across different measurement methods and accommodative states (P < 0.01 for low accommodation).
  • For high accommodation, statistically significant differences were found between method 1 at distance and method 2 (P < 0.05), but not for method 1 at near.
  • The stimulus AC/A ratio values varied, with median values for low accommodation ranging from 1.0 Δ/D to 2.7 Δ/D, and for high accommodation from 3.7 Δ/D to 4.7 Δ/D.

Conclusions:

  • The stimulus AC/A ratio is significantly influenced by the measurement technique and the level of accommodative stimulus employed.
  • Employing a high accommodative stimulus during measurements may help reduce variability and potential discrepancies arising from different measurement techniques.