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1. The analysis of corneal asphericity (Q value) and its related factors of 1,683 Chinese eyes older than 30 years.

Author

Ying Xiong, Jing Li, Ningli Wang, Xue Liu, Zhao Wang, Frank F Tsai, and Xiuhua Wan

Subjects
Medicine, Science
Abstract

To determine corneal Q value and its related factors in Chinese subjects older than 30 years.Cross sectional study.1,683 participants (1,683 eyes) from the Handan Eye Study were involved, including 955 female and 728 male with average age of 53.64 years old (range from 30 to 107 years). The corneal Q values of anterior and posterior surfaces were measured at 3.0, 5.0 and 7.0mm aperture diameters using Bausch & Lomb Orbscan IIz (software version 3.12). Age, gender and refractive power were recorded.The average Q values of the anterior surface at 3.0, 5.0 and 7.0mm aperture diameters were -0.28±0.18, -0.28±0.18, and -0.29±0.18, respectively. The average Q value of the anterior surface at the 5.0mm aperture diameter was negatively correlated with age (B = -0.003, p

Published
2017
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2. The analysis of corneal asphericity (Q value) and its related factors of 1,683 Chinese eyes older than 30 years

Author

Xiong Ying, Xiuhua Wan, Zhao Wang, Frank F. Tsai, Jing Li, Ningli Wang, and Xue Liu

Subjects
Male, Aging, Eye Diseases, lcsh:Medicine, 01 natural sciences, Cornea, 0302 clinical medicine, Elderly, Medicine and Health Sciences, Chinese subjects, Geriatric Ophthalmology, lcsh:Science, Aged, 80 and over, Multidisciplinary, Geography, Corneal asphericity, Middle Aged, medicine.anatomical_structure, Female, Anatomy, Research Article, Adult, Cartography, medicine.medical_specialty, Geriatric ophthalmology, China, Q value, Ocular Anatomy, Anterior surface, Refraction, Ocular, 010309 optics, 03 medical and health sciences, Topographic Maps, Age groups, Ocular System, Ophthalmology, 0103 physical sciences, medicine, Humans, Aged, Related factors, business.industry, lcsh:R, Biology and Life Sciences, Cross-Sectional Studies, Age Groups, Geriatrics, People and Places, 030221 ophthalmology & optometry, Earth Sciences, Eyes, Population Groupings, lcsh:Q, business, Head
Abstract

Purpose To determine corneal Q value and its related factors in Chinese subjects older than 30 years. Design Cross sectional study. Methods 1,683 participants (1,683 eyes) from the Handan Eye Study were involved, including 955 female and 728 male with average age of 53.64 years old (range from 30 to 107 years). The corneal Q values of anterior and posterior surfaces were measured at 3.0, 5.0 and 7.0mm aperture diameters using Bausch & Lomb Orbscan IIz (software version 3.12). Age, gender and refractive power were recorded. Results The average Q values of the anterior surface at 3.0, 5.0 and 7.0mm aperture diameters were -0.28±0.18, -0.28±0.18, and -0.29±0.18, respectively. The average Q value of the anterior surface at the 5.0mm aperture diameter was negatively correlated with age (B = -0.003, p

Published
2017

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