COMPARATIVE VALIDITY OF LEA CONTRAST SENSITIVITY CHART TO PELLI-ROBSON CONTRAST SENSITIVITY CHART IN NEURO-OPHTHALMOLOGY PATIENTS
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Contrast sensitivity Test, Pelli-Robson Chart, LEA Number Chart, Conversion
Abstract
INTRODUCTION AND OBJECTIVE
The Pelli-Robson and LEA contrast sensitivity chart are widely used to measure clinical contrast
sensitivity. The Pelli-Robson is a gold standard with the limitation of its bulky size. The LEA
contrast sensitivity chart offers a reliable test in a way more practical and portable chart. This
condition led to a question of whether we can predict Pelli-Robson score based on the LEA score.
This study developed a conversion method to facilitate the transition from the LEA to the PelliRobson and validating the conversion score.
METHODS
This study retrospectively examined the relationship between LEA and Pelli-Robson Contrast
Sensitivity Test. There were 120 eyes included in this study. We produced a conversion table
using the equipercentile equating method. Then, we evaluated the reliability and accuracy of this
algorithm to convert the LEA to the Pelli-Robson contrast sensitivity score.
RESULTS
LEA scores were converted to Pelli-Robson scores according to a conversion table that achieved
a reliability of 0.91 based on intraclass correlation. The accuracy of this algorithm was 81.6%
within 1 point difference from the raw score.
CONCLUSIONS
This study reported a reliable and comparable conversion algorithm for transforming LEA scores
into converted estimated Pelli-Robson scores. This method will enhance the utility of existing data
in clinical and research settings.
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Authors
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