November 2014
Volume 55, Issue 11
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Research Highlight  |   November 2014
Twin Study Implicates Genetic Factors in Dry Eye Disease
Author Affiliations
  • Madeleine K. M. Adams
    Department of Ophthalmology, Princess Alexandra Hospital, Brisbane, Australia
    Department of Ophthalmology, University of Melbourne, Melbourne, Australia; Madeleine.adams@me.com
Investigative Ophthalmology & Visual Science November 2014, Vol.55, 7284. doi:10.1167/iovs.14-15745
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      Madeleine K. M. Adams; Twin Study Implicates Genetic Factors in Dry Eye Disease. Invest. Ophthalmol. Vis. Sci. 2014;55(11):7284. doi: 10.1167/iovs.14-15745.

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Dry eye is a common chronic ocular condition that significantly reduces the quality of life of afflicted individuals. As well as a frequent cause of ocular irritation, dry eye can lead to visual disability, and may compromise the results of corneal, cataract, and refractive surgery.1 The average cost to US society of managing dry eye has been estimated at $55.4 billion.2 
Dry eye disease encompasses a group of disorders of the tear film; attributed to either reduced tear production or excessive tear evaporation, or both. There may be inconsistent correlation between symptoms and signs, making clinical diagnosis problematic. Current treatments are largely palliative. Although symptoms can improve with treatment, there is no cure.3 
Epidemiologic information on dry eye disease has been limited by the variety of definitions employed and the lack of diagnostic tests of high sensitivity and specificity.4 Female sex, increasing age, Sjorgren's syndrome, and smoking have been identified as risk factors; other systemic diseases are also associated. Understanding the genetic factors of a disease can provide insights into the pathogenesis of disease, and hence lead to more effective treatment. To date, there is very little information on the role genetics plays in the dry eye phenotype, or the relative importance they have to environmental factors. 
Vehof et al.5 have employed an elegant classical twin study using a cohort of British, middle aged, elderly female twins. Despite the difficulties in phenotyping this multifactorial disease, they have demonstrated that genes are moderately important in dry eye disease. A heritability of approximately 30% was indicated for symptoms and 40% for diagnosis, with a varying heritability of 25% to 80% for various selected signs; the unique environment explained the remainder of the variance. Vehof et al.5 have paved the way for further genetic studies by showing that genetic factors play a significant role in dry eye disease. 
References
Gayton JL. Etiology, prevalence, and treatment of dry eye disease. Clin Ophthalmol. 2009; 3: 405–412. [CrossRef] [PubMed]
Yu J Asche CV Fairchild CJ. The economic burden of dry eye disease in the United States: a decision tree analysis. Cornea. 2011; 30: 379–387. [CrossRef] [PubMed]
Management and therapy of dry eye disease: report of the Management and Therapy Subcommittee of the International Dry Eye WorkShop ( 2007). Ocul Surf. 2007; 5: 163–178.
Definition and Classification Subcommittee of the International Dry Eye Workshop. The definition and classification of dry eye disease: report of the Definition and Classification Subcommittee of the International Dry Eye Workshop (2007). Ocul Surf. 2007; 5: 75–92. [CrossRef] [PubMed]
Vehof J Wang B Kozareva D Hysi PG Snieder H Hammond CJ. The heritability of dry eye disease in a female twin cohort. Invest Ophthalmol Vis Sci. 2014; 55: 7278–7284. [CrossRef] [PubMed]
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