Louis R Pasquale1, Aliya Z Jiwani2, Tzukit Zehavi-Dorin3, Arow Majd3, Douglas J Rhee4, Teresa Chen2, Angela Turalba2, Lucy Shen2, Stacey Brauner2, Cynthia Grosskreutz5, Matthew Gardiner2, Sherleen Chen2, Sheila Borboli-Gerogiannis2, Scott H Greenstein2, Kenneth Chang2, Robert Ritch6, Stephanie Loomis7, Jae H Kang7, Janey L Wiggs2, Hani Levkovitch-Verbin3. 1. Channing Division of Network Medicine, Department of Medicine, Harvard Medical School, Brigham and Women's Hospital, Boston, Massachusetts2Department of Ophthalmology, Harvard Medical School, Massachusetts Eye and Ear Infirmary, Boston. 2. Department of Ophthalmology, Harvard Medical School, Massachusetts Eye and Ear Infirmary, Boston. 3. Goldschleger Eye Institute, Chaim Sheba Medical Center, Tel Aviv University, Tel Hashomer, Israel. 4. Department of Ophthalmology, Harvard Medical School, Massachusetts Eye and Ear Infirmary, Boston4Department of Ophthalmology and Visual Sciences, Case Western Reserve University, Cleveland, Ohio. 5. Department of Ophthalmology, Harvard Medical School, Massachusetts Eye and Ear Infirmary, Boston5currently withNovartis Institute for BioMedical Research, Cambridge, Massachusetts. 6. Einhorn Clinical Research Center, New York Eye and Ear Infirmary of Mount Sinai, New York. 7. Channing Division of Network Medicine, Department of Medicine, Harvard Medical School, Brigham and Women's Hospital, Boston, Massachusetts.
Abstract
IMPORTANCE: Residential (geographic) history and extent of solar exposure may be important risk factors for exfoliation syndrome (XFS) but, to our knowledge, detailed lifetime solar exposure has not been previously evaluated in XFS. OBJECTIVE: To assess the relation between residential history, solar exposure, and XFS. DESIGN, SETTING, AND PARTICIPANTS: This clinic-based case-control study was conducted in the United States and Israel. It involved XFS cases and control individuals (all ≥ 60-year-old white individuals) enrolled from 2010 to 2012 (United States: 118 cases and 106 control participants; Israel: 67 cases and 72 control participants). MAIN OUTCOMES AND MEASURES: Weighted lifetime average latitude of residence and average number of hours per week spent outdoors as determined by validated questionnaires. RESULTS: In multivariable analyses, each degree of weighted lifetime average residential latitude away from the equator was associated with 11% increased odds of XFS (pooled odds ratio [OR], 1.11; 95% CI, 1.05-1.17; P < .001). Furthermore, every hour per week spent outdoors during the summer, averaged over a lifetime, was associated with 4% increased odds of XFS (pooled OR, 1.04; 95% CI, 1.00-1.07; P = .03). For every 1% of average lifetime summer time between 10 am and 4 pm that sunglasses were worn, the odds of XFS decreased by 2% (OR, 0.98; 95% CI, 0.97-0.99; P < .001) in the United States but not in Israel (OR, 1.00; 95% CI, 0.99-1.01; P = .92; P for heterogeneity = .005). In the United States, after controlling for important environmental covariates, history of work over water or snow was associated with increased odds of XFS (OR, 3.86; 95% CI, 1.36-10.9); in Israel, there were too few people with such history for analysis. We did not identify an association between brimmed hat wear and XFS (P > .57). CONCLUSIONS AND RELEVANCE: Lifetime outdoor activities may contribute to XFS. The association with work over snow or water and the lack of association with brimmed hat wear suggests that ocular exposure to light from reflective surfaces may be an important type of exposure in XFS etiology.
IMPORTANCE: Residential (geographic) history and extent of solar exposure may be important risk factors for exfoliation syndrome (XFS) but, to our knowledge, detailed lifetime solar exposure has not been previously evaluated in XFS. OBJECTIVE: To assess the relation between residential history, solar exposure, and XFS. DESIGN, SETTING, AND PARTICIPANTS: This clinic-based case-control study was conducted in the United States and Israel. It involved XFS cases and control individuals (all ≥ 60-year-old white individuals) enrolled from 2010 to 2012 (United States: 118 cases and 106 control participants; Israel: 67 cases and 72 control participants). MAIN OUTCOMES AND MEASURES: Weighted lifetime average latitude of residence and average number of hours per week spent outdoors as determined by validated questionnaires. RESULTS: In multivariable analyses, each degree of weighted lifetime average residential latitude away from the equator was associated with 11% increased odds of XFS (pooled odds ratio [OR], 1.11; 95% CI, 1.05-1.17; P < .001). Furthermore, every hour per week spent outdoors during the summer, averaged over a lifetime, was associated with 4% increased odds of XFS (pooled OR, 1.04; 95% CI, 1.00-1.07; P = .03). For every 1% of average lifetime summer time between 10 am and 4 pm that sunglasses were worn, the odds of XFS decreased by 2% (OR, 0.98; 95% CI, 0.97-0.99; P < .001) in the United States but not in Israel (OR, 1.00; 95% CI, 0.99-1.01; P = .92; P for heterogeneity = .005). In the United States, after controlling for important environmental covariates, history of work over water or snow was associated with increased odds of XFS (OR, 3.86; 95% CI, 1.36-10.9); in Israel, there were too few people with such history for analysis. We did not identify an association between brimmed hat wear and XFS (P > .57). CONCLUSIONS AND RELEVANCE: Lifetime outdoor activities may contribute to XFS. The association with work over snow or water and the lack of association with brimmed hat wear suggests that ocular exposure to light from reflective surfaces may be an important type of exposure in XFS etiology.
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