A 10-year population-based cohort analysis of cataract surgery rates in Ontario.

Background: We studied the rates and distribution of cataract surgery throughout Ontario using population-based administrative data.

Methods: We identified patients who had had cataract surgery performed between April 1, 1994, and March 31, 2005. We calculated crude cataract surgery rates, overall and regional adjusted rates per 100,000 residents aged 65 and over, and age- and sex-specific rates.

Results: The number of cataract surgeries performed on patients over 65 more than doubled, from 43,818 to 90,183, over the 10-year period and accounted for approximately 81% of all cataract surgeries in Ontario. Age- and sex-adjusted rates varied considerably among health administrative geographic regions. For 2004-2005, rates including all cataract surgeries ranged from 4272 to 6563 cataract surgeries per 100,000 residents aged 65 or older.

Interpretation: There has been a significant increase in the number of cataract surgeries performed over the past decade in Ontario with considerable regional variation. Observed rates were higher than those reported for other countries.