Abstract
To clarify whether smoking was associated with elevated intraocular pressure (IOP) and to evaluate the interrelationship among IOP, blood viscosity, and smoking. 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 79years, who had not undergone any ocular surgery or medical treatment for hypertension, ocular hypertension, and glaucoma. 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. The results of this study suggested that the IOP level may be substantially affected by smoking habit in middle-aged and older Japanese men.
Highlights
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 intraocular pressure (IOP) in men (P \ 0.05)
The results of this study suggested that the IOP level may be substantially affected by smoking habit in middle-aged and older Japanese men
All parameters measured were significantly higher in men than in women (IOP, P \ 0.05; SBP, DBP, and BMI; P \ 0.01)
Summary
A. Kokaze Department of Public Health, Showa University School of Medicine, Tokyo, Japan. M. Harada Department of Living Science, Teikyo Junior College, Tokyo, Japan. It is well known that smoking is a confirmed risk factor for various cancers, cerebro-cardiovascular diseases, and chronic obstructive pulmonary disease. Several epidemiological studies have reported the association of smoking with glaucoma [2,3,4,5,6] and elevated intraocular pressure (IOP) [7,8,9,10,11], the role of smoking as a risk factor for them remains controversial. Positive associations of smoking with glaucoma [2, 4, 6] and elevated IOP [7, 9, 11] have been found, other studies have reported no association of smoking with glaucoma [3, 5] and elevated IOP [8, 10]
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