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  • Title: Comparison of low-contrast visual acuity between eye black and maxsight tinted contact lenses.
    Author: Horn FC, Erickson GB, Karben B, Moore B.
    Journal: Eye Contact Lens; 2011 May; 37(3):147-52. PubMed ID: 21378576.
    Abstract:
    OBJECTIVES: Athletes who participate in outdoor activities seek products to reduce glare and improve contrast. This study compares performance of low-contrast visual acuity (VA) in bright outdoor conditions between the Maxsight Amber contact lens (CLs) and clear CLs with and without Eye Black grease. METHODS: Seventeen subjects were fitted with clear CLs, clear lenses with Eye Black grease, Maxsight lenses with Eye Black grease, and Maxsight lenses alone. With each modality, the subject demonstrated low-contrast VA assessed and completed a questionnaire. At the end of testing, subjects completed a questionnaire to survey the performance of each modality. RESULTS: The average low-contrast VA with clear CLs was 20/18.4, which improved to 20/17 with the addition of Eye Black grease (P=0.132). Significant improvement in low-contrast VA was seen with the Maxsight CLs to 20/15.4 (P<0.05), although it was not further improved with the addition of Eye Black grease. The results of the questionnaire showed a preference of the Maxsight CLs throughout the study for low-contrast VA. CONCLUSIONS: Although Eye Black grease has its place in sport and some sporting environments, the benefit in contrast acuity is insignificant. The better performance of the amber Maxsight lenses in this study demonstrates a visual performance benefit in bright sunlight.
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