Visual Outcomes of Cataract Surgery in the United States, Canada, Denmark, and Spain

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Abstract
TO INVESTIGATE the effect of alternative treatment modalities on health outcomes, the US National Cataract Patient Outcomes Research Team (PORT) studied variation in preoperative, intraoperative, and postoperative cataract surgical management. The study showed that, in the United States, the identified variation in treatment modalities only moderately affects patient outcomes.1-4 The International Cataract Surgery Outcomes Study was established in 1992 to assess the impact of variation in the management of cataract on patient outcomes across health care systems in 4 sites: the United States, Denmark, the Province of Manitoba (Canada), and the City of Barcelona (Spain). In the 4 sites, instruments developed by the US National PORT were used for the primary data collection. Patients were observed for at least 4 months postoperatively.