Prevalence of Visual Impairment in the Adult Japanese Population by Cause and Severity and Future Projections

Abstract

Purpose: To present a comprehensive estimate of the total number of people with visual impairment in the adult Japanese population by age, gender, severity and cause, and to estimate future prevalence based on population projections and expected demographic changes.

Methods: Definitions of visual impairment used in this study were based on the United States criteria. Total visual impairment was calculated as the sum of low vision and blindness. The prevalence estimates were based on input from a number of Japanese epidemiological surveys, census material and official population projections.

Results: There were an estimated 1.64 million people with visual impairment in 2007 in Japan. Of these, 187,800 were estimated to be blind. The prevalence of visual impairment in Japan increased with age and half of the people with visual impairment were aged 70 years or older. The leading causes of visual impairment in Japan were glaucoma (24.3%), diabetic retinopathy (20.6%), degenerative myopia (12.2%), age-related macular degeneration (10.9%), and cataract (7.2%). These five major causes comprised three-quarters of all visual impairment. The prevalence of visual impairment was projected to increase from 1.3% of the population in 2007 to 2.0% by 2050.

Conclusions: This comprehensive study presents the prevalence of total visual impairment in the adult Japanese population. The projected increases in the prevalence of visual impairment over time reflect the demographic changes of a declining and aging Japanese population. These projections highlight that the burden of disease due to visual impairment and imposed on society is likely to increase.

KEYWORDS::

• Burden of disease
• Epidemiology
• Eye disease
• Prevalence
• Visual impairment

ACKNOWLEDGMENTS

This study was supported by the grant from National Hospital Organization in Japan and the grant from the Japan Ophthalmologists Association. Assistance was provided by Professor Akira Murakami from the Department of Ophthalmology, Juntendo University School of Medicine, and Professor Shunichi Fukuhara from the Department of Epidemiology and Health Care Research, Kyoto University.

Declaration of Interest: The authors have no proprietary interest in any materials mentioned in this article.