Expected Lifetime with and without Cataract among Older Adults in China

Despite its curability by a simple and low-cost surgical procedure, cataract remains the leading cause—accounting for almost
one-half—of all blindness in the world. The problem is particularly severe in developing countries, and with the ageing of
populations and increasing life expectancy, the burden of cataract disease is expected to increase substantially in the coming
years. Using a demographic approach, this study examined the prevalence of cataract and estimated lifetime with and without
cataract among older adults in China, a rapidly ageing country with the world’s largest population. Data came from the 2002
Chinese Longitudinal Healthy Longevity Survey and life tables in the same year. Sullivan’s method was used. The results indicated
that overall, 5.7% percent of Chinese aged 65 and over reported having cataract that is diagnosed by an ophthalmologist. Cataract
increases with age, affects women more than men, and is higher in urban than rural areas. At age 65, men and women can expect
on average 0.7 years (4.7%) and 1.2 years (7.3%) of remaining life with cataract, respectively. The corresponding figures
for urban and rural older adults are 1.7 (9.8%) and 0.6 (4.1%) years. The prevalence rates and life expectancy with cataract
were likely underestimated given the low levels of eye examinations to detect eye diseases among the Chinese, particularly
in rural areas. We discussed preventive strategies to minimize the risk and delay the onset of cataract. Policy measures pertaining
to availability and accessibility of cataract surgeries are further discussed.