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KD McCarthy, GJ Ehlert, KL Canavan, ML Henderson, SB Hickson-Curran; Enhanced Tinted Soft Contact Lenses and Binocular Visual Performance . Invest. Ophthalmol. Vis. Sci. 2002;43(13):3087.
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Purpose: To evaluate the binocular visual performance (VP) of enhanced tinted contact lenses with a full iris tint covering the pupillary area. Methods: 117 successful soft contact lens wearers completed the study. The test lenses evaluated by each subject were: ACUVUE® 2 COLOURSTM Brand Contact Lenses and CIBA Focus® Softcolors®. The control lenses were ACUVUE® 2 COLOURSTM Brand Contact Lenses with a visibility tint. The population was randomly divided into three subpopulations, one for each available color. A spectacle refraction was used to determine the best spherical contact lens power. Each subject was tested at high (250cd/m2) and low (2.5cd/m2) background luminance levels using Guillon-Poling high and low contrast LogMar charts. Different letter configurations were utilized in order to minimize letter memorization. A mixed linear model, treating subjects as a random effect was used to examine differences between lenses. Results: An overall lens effect for all test conditions combined was detected between ACUVUE® 2 COLOURSTM Brand, ACUVUE® 2 Brand, and CIBA Focus® Softcolors® (p<0.0001) with all pairwise comparisons also significantly different. A difference of 0.05 LogMar, which is equivalent to 2.5 letters on the Guillon-Poling LogMar charts is considered clinically significant. The pairwise differences were mostly in dim illumination/low contrast conditions where the results favored ACUVUE® 2 over ACUVUE® 2 COLOURSTM (p=0.0226, mean difference=0.0150 LogMar) and ACUVUE® 2 over CIBA Focus® Softcolors® (p<0.0001, mean difference=0.0336 LogMar). While there were no overall statistically differences between ACUVUE® 2 COLOURSTM and CIBA Focus® Softcolors® aqua and blue colors (p=0.3820 and p=0.1116, respectfully), there was an overall statistical difference within the green color in dim illumination favoring ACUVUE® 2 COLOURSTM (p=0.0045, mean difference=0.0161 LogMar). Conclusion: There is a difference in VP between cosmetically tinted lenses in enhancer shades and visibility tinted contact lenses under dim illumination conditions. The cosmetically tinted lenses perform slightly worse than the visibility tinted lenses. This difference is, however, not considered clinically relevant. An overall difference in VP between the two test lenses was found in the green enhancer color in dim illumination for both high and low contrast conditions, where the ACUVUE® 2 COLOURSTM lenses were found to be statistically better than the CIBA Focus® Softcolors® lenses. However, this difference is not considered clinically relevant.
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