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Quantification of Ocular Biologically Effective UV Exposure for Different Rotation Angle Ranges Based on Data from a Manikin
Author(s) -
Hu Liwen,
Wang Fang,
OuYang NanNing,
Gao Na,
Gao Qian,
Ge Tiantian,
Gao Yanyan,
Liu Guangcong,
Zheng Yang,
Liu Yang
Publication year - 2014
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/php.12267
Subject(s) - rotation (mathematics) , irradiance , ultraviolet , angle of rotation , elevation angle , optics , chemistry , physics , mathematics , azimuth , geometry
Human outdoor activities are randomly orientated at different angles to the sun. To quantify the ocular UV and biologically effective UV ( UVBE ; i.e. the ocular UV irradiance exposure for photokeratitis ( UV pker), photoconjunctivitis ( UV pcon), and cataract ( UV cat)) exposure for different rotation angle ranges, a rotating manikin was used to monitor the ocular UV exposure at different rotation angles in clear skies during July 2010 in Sanya, China. As a result, the ocular UV and UVBE irradiance was directly influenced by the rotation angle variations, primarily for the 120° rotation angle ranges facing the morning and afternoon sun when the solar elevation was lower than 60°; during these times, the UV and UVBE spectral irradiance decreased as the rotation angle increased. When compared to the 360° rotation angle ranges (which were considered to be the average exposure situation), the cumulative ocular UVBE for 60°, 120° and 180° rotation angle ranges were maximally 91% ( UV cat), 94% ( UV pker) and 121% ( UV pcon); 71% ( UV cat), 74% ( UV pker) and 95% ( UV pcon); 42%( UV cat), 45%( UV pker) and 55% ( UV pcon) higher respectively. Meanwhile, the cumulative ocular UVBE for the 180° rotation angle ranges facing away from the sun were 46% ( UV pker), 59% ( UV pcon) and 45% ( UV cat) lower.