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The Thai logarithmic visual acuity chart.

Paisan Ruamviboonsuk1, Montip Tiensuwan

  • 1Department of Ophthalmology, Rajavithi Hospital, Bangkok, Thailand.

Journal of the Medical Association of Thailand = Chotmaihet Thangphaet
|September 27, 2002
PubMed
Summary

The Thai visual acuity chart shows comparable Snellen scores to the standard chart. While ETDRS scores differ statistically, the Thai chart offers low test-retest variability for research monitoring.

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Area of Science:

  • Ophthalmology
  • Optometry
  • Vision Science

Background:

  • Accurate visual acuity measurement is crucial for diagnosing and monitoring eye conditions.
  • Standardized charts are essential for consistent and comparable visual acuity assessments.
  • Developing culturally relevant tools, like the Thai visual acuity chart, can improve accessibility and usability.

Purpose of the Study:

  • To compare visual acuity scores obtained using the Thai visual acuity chart versus the standard logarithmic visual acuity chart.
  • To evaluate the reliability and agreement between the two charts for different scoring methods.

Main Methods:

  • A comparative non-randomized clinical study involving 153 participants aged 18-80 without ocular disease.
  • Visual acuity was measured using both Thai and standard charts without refractive correction, employing Snellen (whole line) and ETDRS (letter-by-letter) scoring.
  • Statistical analysis included weighted Kappa for Snellen scores and paired t-tests for ETDRS scores, with test-retest reliability assessed in a subset of participants.

Main Results:

  • High agreement was found between Snellen scores from the Thai and standard charts (k=0.7375).
  • High correlation was observed for ETDRS scores between the Thai and standard charts (r=0.947), with low test-retest variability for both charts.
  • A statistically significant difference was noted in ETDRS scores between the Thai and standard charts (p<0.0001).

Conclusions:

  • The Thai visual acuity chart demonstrates comparable performance to the standard chart for Snellen scoring.
  • Despite statistical differences in ETDRS scores, the Thai chart exhibits low test-retest variability, making it suitable for monitoring ETDRS scores in research.
  • The Thai visual acuity chart is a potentially valuable tool for ophthalmological and optometric assessments in Thailand.

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