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Achieving Accurate IOL Power Calculations.
Cataract surgery has been pushed from a
purely medical procedure to one of refractive or "vision correcting"
qualities.
Intraocular Lens Power Calculations.
Over the last decade, IOL power calculations have become a focal point of cataract surgery. In 1977, the state-of-the-art for estimating IOL power for emmetropia was to simply add +19.0 D to the pre-cataractous refraction. A decade later, being within ±1.00 D of the target refraction was still considered a reasonable standard. The standard for accuracy for normal eyes was more recently addressed in the United Kingdom in the 2006 study: "Benchmark standards for refractive outcomes after NHS cataract surgery." The authors concluded that the "benchmark" standard for refractive outcomes for normal eyes after cataract surgery should be within ±0.50 D for 55% of cases and within ±1.00 D for 85% of cases.1
Today, by carefully optimizing the individual component parts of IOL power calculations, combined with advanced surgical techniques, it is possible to be within ±0.50 D for better than 70 percent of surgeries and ±1.00 D for better than 90% of surgeries.2 By tracking your outcomes, you can see where you are in relation to this published "benchmark" standard.
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Dr. Hill volunteers hundreds of hours and his personal resources to make the information on this website available to you. If you would care to buy him a cup of coffee, donate towards operating expenses, or just to say thank you, your contribution is welcome. |
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