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Construction and Validation of LEA Hindi Chart: A Multicenter Study.

Sourav Datta, Srinivasa Varadharajan1, Deepmala Mazumdar2

  • 1International School of Engineering, Hyderabad, India.

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|May 16, 2020
PubMed
Summary

A new Hindi visual acuity chart, the LEA Hindi chart, has been developed and validated. It provides comparable results to standard charts like ETDRS and Landolt C, ensuring reliable vision testing for Hindi speakers.

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Area of Science:

  • Ophthalmology
  • Optometry
  • Vision Science

Background:

  • Visual acuity charts are essential tools for assessing vision.
  • Standard charts may not be suitable for all language demographics.
  • Developing culturally and linguistically appropriate charts is crucial for accurate eye care.

Purpose of the Study:

  • To construct and validate a new logMAR (logarithm of the Minimum Angle of Resolution) Hindi visual acuity chart, named the LEA Hindi chart.
  • To ensure the chart's principles align with established methods like the LEA symbols acuity chart.

Main Methods:

  • A multicenter study involving Hindi optotype construction using calligraphy.
  • Calibration of Hindi optotypes against Landolt C optotypes.
  • Validation of the LEA Hindi chart against the Early Treatment Diabetic Retinopathy Study (ETDRS) and Landolt C charts in 60 participants.
  • Repeatability testing with an additional 15 participants.

Main Results:

  • The LEA Hindi chart demonstrated comparable visual acuity measurements to both Landolt C and ETDRS charts.
  • LogMAR acuity differences were minimal and statistically insignificant (0.03 ± 0.13 for Landolt C, -0.02 ± 0.09 for ETDRS).
  • The chart exhibited good repeatability, with 95% limits of agreement within 0.24 logMAR.

Conclusions:

  • The LEA Hindi visual acuity chart is a valid and reliable tool for assessing vision in Hindi-speaking individuals.
  • Its performance is comparable to established international standards (ETDRS, Landolt C).
  • The chart is suitable for routine clinical use and research studies requiring repeated visual acuity measurements.