Optimized Calculation Methods for Mass, Charitable, and Rural Cataract Surgery Programs: Phacoemulsification

Mass, charitable, and rural cataract surgery programs have proven highly effective at reducing the global burden of avoidable blindness, yet wide variation in surgical and refractive outcomes persists between and within these programs. This chapter argues that much of this variation is attributable not to resource availability alone, but to whether programs treat three operational domains as explicit, calculable quantities rather than inherited rules of thumb: intraocular lens (IOL) power selection, surgical and screening capacity, and programmatic cost structure. For each domain, the governing equations are presented together with their required inputs and a fully worked numerical example. IOL power calculation is addressed through the SRK and SRK II regression formulas, an axial-length-stratified protocol for selecting among third- and fourth-generation vergence formulas, and a method for back-calculating a program-specific optimized lens constant from accumulated postoperative refraction data. Capacity planning is addressed through equations for daily surgical throughput, screening-campaign sizing from historical eligibility and attendance yields, and consumable reorder-point calculation. Cost calculation is addressed through a fixed-variable cost model with an explicit break-even volume, a published micro-costing comparison across surgical techniques, and a program-level cost-per-quality-adjusted-life-year (QALY) framework benchmarked against published Aravind Eye Care System data. Together, these methods are intended to give program directors and operating surgeons a reproducible, low-cost calculation toolkit that can be applied directly to their own program data, independent of the resource setting in which the program operates.