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Red tinted contact lenses on Ishihara test error scores in color deficient subjects:a pilot study

International Journal of Ophthalmology(English edition) 2025年第3期18卷 462-468页

作者： Haliza Abdul Mutalib Sharanjeet Sharanjeet-Kaur Ong Yi Lin Bashirah Ishak MohdNorhafizun Bin Mohd Saman Mohd Izzuddin Hairol Optometry&Vision Sciences Program Faculty of Health SciencesUniversiti Kebangsaan MalaysiaKuala Lumpur 50300Malaysia

AIM:To compare the Ishihara test errors scores of colour vision deficiency(CVD)subjects when wearing four different types of red-tinted contact lenses(RCL)that differ in their transmittance as determined using a ***:Six congenital CVD subjects volunteered to participate in this *** plates were used to determine the colour vision errors made,whereas Farnsworth-Munsell 100 Hue test was conducted to determine the total error scores(TES)and type of *** types of RCL(Types A,B,C and D)were inserted in the non-dominant eye and tested in a randomised manner by a masked *** scores in Ishihara test were determined at baseline without any contact lens and after wearing the four different *** subjects were then divided into two groups based on the mean ***:Repeated measures ANOVA with Greenhouse-Geisser corrections showed that there was a highly significant effect of RCL type on Ishihara error score[F(2.056,10.282)=30.214,P<0.001].Error scores with RCL Type B were significantly lower than errors made when no lens was worn,and with RCL Type C and Type D(all P<0.001).Error scores with RCL Type B were also lower than those made with RCL Type A,however,they were not significantly *** subjects with TES values less than 180,RCL type B showed the largest improvement in Ishihara error score(50%)compared to the other three *** type A showed the best performance in TES value of more than 180,with an improvement of 80%in Ishihara *** Type A has the lowest transmittance at the confusion wavelength(450-568 nm),followed by RCL Types B,D and ***:This study shows that RCL can improve Ishihara error *** with lower transmission at 450-568 nm and 90%transmittance beyond 637 nm are the most *** which could block more light between 550-580 nm are more effective for colour defectives with more severe colour defects.

关键词： anomalous trichromats colour vision deficiency contact lenses deutan protan

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