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Efficacy of red contact lens in improving color vision test performance based on Ishihara, Farnsworth D15, and Martin Lantern Test.

Authors
  • Oli, Avadhesh1
  • Joshi, D2
  • 1 Post Doctoral Fellow, Kannuri Santhamma Institute of Vitreo Retinal Diseases, LV Prasad Eye Institute, Hyderabad, India. , (India)
  • 2 Consultant (Ophthalmology), INHS Ashvini, Colaba, Mumbai, India. , (India)
Type
Published Article
Journal
Medical Journal Armed Forces India
Publisher
Elsevier
Publication Date
Oct 01, 2019
Volume
75
Issue
4
Pages
458–463
Identifiers
DOI: 10.1016/j.mjafi.2018.08.005
PMID: 31719742
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

The aim of this study was to evaluate the efficacy of red contact lens in improving color vision test performance based on Ishihara, Farnsworth D15, and Martin Lantern Test (MLT). Thirty subjects with a known color vision defect were enrolled after consent. The color vision was assessed using Ishihara test, D15 test, and MLT. The error scores were recorded. The test was repeated after using a red contact lens. The mean error scores were 7.87 (±1.00), 3.33 (±3.15), and 5.67 (±2.52) on Ishihara, MLT, and D15 test, respectively. The error scores reduced to 3.93 (±3.78), 1.33 (±1.34), and 2.77 (±2.12) Ishihara, MLT, and D15 test, respectively (P value < 0.05, Wilcoxon rank test). None of the subjects were in color perception (CP) II at presentation but 47.5% became CP II with the lens on Ishihara test. Ninety percent could pass the MLT CP III standard. This study shows that red lens reduced error scores and subjects could pass the color vision tests. Notwithstanding the improvement in performance on color vision tests, lens is not recommended for personnel on active combat duty. The recruiting medical officer needs to be aware of the fact that a subject with defective color vision can pass various tests with a red contact lens. © 2018 Armed Forces Medical Services (AFMS).

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