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Estimating Visual Acuity Without a Visual Acuity Chart.

Yueh-Hsun Wu1,2, Deyue Yu1, Judith E Goldstein3

  • 1College of Optometry, The Ohio State University, Columbus, OH, USA.

Translational Vision Science & Technology
|September 18, 2024
PubMed
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This summary is machine-generated.

This study shows that simple yes/no questions about recognizing everyday objects can estimate a person's visual acuity (VA). This method offers a potential tool for assessing vision, especially in low-vision individuals.

Area of Science:

  • Ophthalmology
  • Vision Science
  • Psychometrics

Background:

  • Assessing visual acuity (VA) is crucial for diagnosing and managing vision impairments.
  • Traditional VA measurement methods require specialized equipment and trained personnel.
  • Developing accessible and reliable methods for VA estimation is essential, particularly for remote or underserved populations.

Purpose of the Study:

  • To determine if self-reported ability to recognize everyday objects via yes/no questions can accurately estimate visual acuity (VA).
  • To explore the potential of a questionnaire-based approach for vision assessment.

Main Methods:

  • 385 participants completed 100 yes/no questions assessing object recognition at various distances.
  • Item response theory (IRT) was used to analyze responses and estimate vision ability.

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  • Estimated VA was compared with measured VA using logarithm of the minimum angle of resolution (logMAR).

    • Main Results:

    • A strong negative correlation (r = -0.72) was found between estimated vision ability and measured VA.
    • A linear relationship allowed prediction of VA from self-reported vision ability with low prediction error (0.24 logMAR unsigned).
    • The study identified the VA limit required for each question, e.g., 1.0 logMAR for moon recognition.

    Conclusions:

    • Yes/no questions about everyday visual tasks can effectively estimate an individual's visual acuity.
    • This approach shows promise for accessible vision screening and monitoring.
    • Further refinements could enhance the reliability and clinical utility of this method.