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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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