Reducing the carbon footprint of cataract surgery: co-creating solutions with a departmental Delphi process.

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Climate change is arguably the greatest threat to global health of the 21st century. Although cataract surgery is a major contributor to global greenhouse gas emissions, recent literature review identified a paucity of evidence-based strategies for improving the environmental impact of cataract services. Our study aimed to assess the effectiveness of a departmental Delphi process for improving cataract services' environmental sustainability. All members of ophthalmology theatre teams in a UK teaching hospital were invited to participate in a three-stage Delphi process. Team members were surveyed for suggestions for reducing the department's environmental impact. Suggested interventions were refined during a plenary face-to-face discussion and ranked. The highest ranked interventions were combined into a mutually agreed action plan. Data on the economic and environmental cost of cataract services was collected prior to and six months after the Delphi process using the Eyefficiency mobile application. Twenty-three interventions were suggested by a range of staff cadres. Interventions were ranked by 24 team members. The 2nd, 4th, 5th, 8th and 11th ranked interventions were combined into an "Eco-packs" project in collaboration with suppliers (Bausch + Lomb), saving 675 kg of waste and 350 kg of CO2 equivalent annually. The Delphi process is an effective method for provoking departmental engagement with the sustainability agenda that we would encourage all ophthalmology departments to consider utilising. The baseline per case CO2 equivalent measured in our department was reproducible and could serve as a maximum benchmark to be improved upon.