The Distribution of Intraocular Pressure in Urban and in Rural Populations: The Namil Study in South Korea

Suh, Wool; Kee, Changwon

doi:10.1016/j.ajo.2012.01.009

Cited by 35 publications

(47 citation statements)

References 21 publications

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“…By contrast, IOP was found to decrease with age in Asian populations [32][33][34]. The association of IOP with age, BP, and BMI observed in this study was consistent with that found in several Asian countries.…”

Section: Discussionsupporting

confidence: 81%

Association of Smoking with Intraocular Pressure in Middle-Aged and Older Japanese Residents.

Yoshida

Ishikawa

Take

et al. 2015

International Journal of Epidemiology

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Objectives To clarify whether smoking was associated with elevated intraocular pressure (IOP) and to evaluate the interrelationship among IOP, blood viscosity, and smoking. Methods This cross-sectional study analyzed health examination data obtained between 2001 and 2004 from 1113 individuals (829 men and 284 women), ranging in age from 28 to 79 years, who had not undergone any ocular surgery or medical treatment for hypertension, ocular hypertension, and glaucoma. Results Multiple-regression analysis showed that systolic blood pressure (SBP), diastolic blood pressure (DBP), body mass index (BMI), and number of cigarettes smoked per day had a significantly positive association with IOP in men (P \ 0.05). In women also, SBP, DBP, and BMI were positively related to IOP (P \ 0.05). On the contrary, age had a significant negative association with IOP in both sexes (P \ 0.01). Analysis of covariance and multiple logistic regression analyses showed that the adjusted mean IOP and the multivariate odds ratios for IOP increased with increasing cigarette consumption in men (P for trend = 0.01 and 0.06, respectively). Analysis of covariance found that smoking was significantly associated with both high IOP and high hematocrit in men (P for trend \0.05); however, the adjusted mean IOP values were higher in smokers than in nonsmokers, regardless of the hematocrit level.Conclusions The results of this study suggested that the IOP level may be substantially affected by smoking habit in middle-aged and older Japanese men.

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Section: Discussionsupporting

confidence: 81%

Association of Smoking with Intraocular Pressure in Middle-Aged and Older Japanese Residents.

Yoshida

Ishikawa

Take

et al. 2015

International Journal of Epidemiology

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“…[22][23][24] Our study was conducted in compliance with the tenets of the Declaration of Helsinki for the use of human subjects in biomedical research. The study was approved by the Institutional Review Board of Chungnam National University Hospital, and written informed consent was obtained from all participants.…”

Section: Methodsmentioning

confidence: 99%

“…The details of the Namil Study have been reported previously. [22][23][24] In brief, subject screening was performed between November 2007 and February 2008. Notices addressed to all residents in the Namil-meon area encouraged participation in the study.…”

Section: Methodsmentioning

confidence: 99%

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Central Corneal Thickness in a Korean Population: The Namil Study

Hwang

Kim

Sohn

2012

Invest. Ophthalmol. Vis. Sci.

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Society 3 PURPOSE. We investigated the distribution of central corneal thickness (CCT), and its association with age, sex, intraocular pressure (IOP), anterior chamber depth (ACD), axial length (AL), and the presence of systemic hypertension and diabetes in a Korean population. METHODS.Our study is a population-based glaucoma prevalence study of residents aged ‡40 years in Namil-meon area, located in central South Korea. All subjects underwent a complete ophthalmic examination that included CCT measurement with an ultrasonic pachymeter, ACD and AL measurements by optical biometry, and Goldmann applanation tonometry. The right eye of all subjects was analyzed.RESULTS. The mean (SD) CCT of the 1259 right eyes was 530.9 (31.5) lm. In univariate analysis, a thicker CCT was associated with a higher IOP (P < 0.001), a longer AL (P ¼ 0.003), and a younger age (P < 0.001). ACD was not correlated significantly with CCT (P ¼ 0.087). Men had a 5.7 lm higher CCT than women (age adjusted, P ¼ 0.001). Subjects with hypertension had a 4.1 lm lower CCT than those without hypertension (age, sex-adjusted, P ¼ 0.027), and the presence of diabetes was not associated significantly with CCT (age, sex-adjusted, P ¼ 0.892). In multivariate analysis, a higher CCT was associated with a higher IOP (P < 0.001), younger age (P ¼ 0.001), male sex (P ¼ 0.005), and the absence of hypertension (P ¼ 0.018).CONCLUSIONS. The mean CCT of a Korean population was 530.9 lm. CCT was associated with IOP, age, sex, and hypertension. (Invest Ophthalmol Vis Sci. 2012;53:6851-6855)

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“…Therefore, we speculate that the central corneal thickness, corneal vertex thickness, and thinnest corneal thickness may be affected by the intensity of sunlight: increased sun intensity may lead to a thicker cornea. Other studies have shown that (from north to south), the central corneal thickness was 521.0 lm in Japanese, 19 530.9 lm in Koreans, 20 535.6 lm in Chinese living in Handan (a city in north China), 21 541.5 lm in Chinese living in Liwan (a city in south China), 8 and 552.3 lm in Singaporean Chinese. 22 Although these studies used sample sizes of a few hundred or few thousand subjects, the trend of these previous data supports our speculation that a more equatorial latitude is associated with increased central corneal thickness, perhaps because of the increased intensity of sunlight and increased exposure to ultraviolet light.…”

Section: Discussionmentioning

confidence: 99%

Distribution and Trends in Corneal Thickness Parameters in a Large Population-Based Multicenter Study of Young Chinese Adults

Liu

Zhang

et al. 2018

Invest. Ophthalmol. Vis. Sci.

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PURPOSE. The purpose of this study was to characterize corneal thickness from multiple regions and determine accurate reference values in young adults for diagnosis and treatment.METHODS. This cross-sectional observational study was conducted from January 2008 through October 2016 using examiner-blinded clinical measurements and included 37,375 healthy eyes from young adults who exhibited normal corneal morphology, had no history of eye surgery or trauma, had stopped wearing soft contact lenses for ‡2 weeks (rigid contact lenses for ‡4 weeks), and had undergone topographies of both eyes on same day. Keratoconus and subclinical keratoconus were excluded. This multicenter study was conducted in four provinces of China: Tianjin, Shandong, Hubei, and Xinjiang.RESULTS. Central corneal, corneal vertex, and thinnest corneal thicknesses were higher in eyes from Hubei than other provinces. The left eye was thicker than the right in patients from Shandong, Tianjin, and Hubei, but not Xinjiang. Overall corneal thickness was higher in eyes from Hubei than from other provinces. Changing trend of the whole-cornea thickness in eyes from Xinjiang differed from eyes from other provinces. Trends in maximum and minimum axial for change of corneal thickness were similar between eyes from Hubei and Xinjiang and between Shandong and Tianjin.CONCLUSIONS. Corneal thickness differs among eyes from different regions. Corneal thickness parameters are influenced by ethnicity and geographical location, as increasing proximity to the equator was related to increasing corneal thickness. Design of refractive surgery and diagnosis of related diseases in patients of a certain area should be based on reference values from its population.

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The Distribution of Intraocular Pressure in Urban and in Rural Populations: The Namil Study in South Korea

Cited by 35 publications

References 21 publications

Association of Smoking with Intraocular Pressure in Middle-Aged and Older Japanese Residents.

Association of Smoking with Intraocular Pressure in Middle-Aged and Older Japanese Residents.

Central Corneal Thickness in a Korean Population: The Namil Study

Distribution and Trends in Corneal Thickness Parameters in a Large Population-Based Multicenter Study of Young Chinese Adults

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