|Title||Comparison of M&S Smart System letter contrast sensitivity and Ridgevue test for iPad results with Pelli-Robson in normally-sighted individuals|
|Author, Co-Author||Rachel Ruben, Susan Kelly, Shin Gerth|
Purpose: The purpose of the study was to compare the reliability of two digital letter-based contrast sensitivity (CS) tests – Ridgevue Contrast Sensitivity for iPad and the M&S Smart System Letter Contrast Sensitivity test (MS) – with the established but no longer in print Pelli-Robson (PR) test.
Methods: Seventeen normally-sighted participants were tested monocularly with each test wearing their habitual correction, in randomized order. Testing was repeated in the same eye for each subject during a second visit at least 3 days after initial testing. Repeatability between the two test administrations, as well as agreement between the three tests were assessed using the 95% limits of agreement ± 1.96 SD of the differences between each administration or test.
Results: The three tests varied in repeatability between administrations: PR = ±0.20, iPad = ±0.33, and MS = ±0.59. Agreement between tests was: PR vs iPad = ±0.32, PR vs MS = ±0.57, and MS vs iPad = ±0.50.
Conclusions: Three tests for contrast sensitivity were compared in a normally-sighted population. The established Pelli-Robson chart demonstrated the best repeatability. The CS test for iPad was found to have better repeatability and agreement with the Pelli-Robson chart than the M&S test.
|Affiliation of Co-Authors||Illinois College of Optometry, Illinois College of Optometry|