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Visual discrimination testing of ultraviolet transmitting and ultraviolet blocking acrylic thermoplastics

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Visual perception has hindered the development of blinded, placebo-controlled ultraviolet light exposure conditions in humans. New acrylic thermoplastics that block or transmit ultraviolet light have visual properties that may provide a solution. Methods:

In a series of triangle taste tests, 60 subjects were tested for the ability to visually perceive ultraviolet light transmission by two of four types of acrylic thermoplastics. Results:

Forty-six of sixty (67%) subjects were unable to visually detect ultraviolet light transmitting acrylics among ultraviolet blocking acrylics in both an ambient light background condition and an ambient light background condition with ultraviolet A light supplementation. Conclusion:

Acrylic thermoplastics allow for the production of blinded, placebo-controlled ultraviolet light exposure conditions by eliminating visual discrimination differences between active and control groups.

Keywords: acrylic thermoplastics; placebo control; triangle taste tests; ultraviolet light

Document Type: Research Article

DOI: http://dx.doi.org/10.1034/j.1600-0781.2002.02766.x

Affiliations: The Department of Dermatology and the Department of Physiology and Pharmacology, Wake Forest University School of Medicine Winston-Salem, NC 27157-1071, USA

Publication date: October 1, 2002

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