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Effective lens position method aids prediction of IOL power in eyes with previous refractive surgery
J Cataract Refract Surg. 2008;34(12):2119-2127.
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Estimating the effective lens position in eyes with previous refractive surgery may be helpful for IOL power calculations when no historical data are available. IOL power calculations in eyes with previous refractive surgery are problematic because of inaccurate calculation of corneal power from the anterior corneal radius and incorrect effective lens position (ELP) resulting from using post-refractive surgery corneal power.
The study included 106 eyes. A rotating Scheimpflug camera was used to measure corneal height, which was applied in double-K IOL power calculation in post-refractive surgery eyes with no available historical data. Investigators retrospectively compared the performance of this ELP estimation and other methods in 11 eyes with previous refractive surgery undergoing cataract surgery.
“Our ELP estimation method gave good estimation for ELP to be used in Holladay 1 and SRK/T formulas when the anterior corneal radius was not known,” the study authors said.
All 11 eyes were within ±1 D of refractive prediction error with the ELP method combined with the BESSt (Borasio Edmondo Smith and Stevens) formula or Savini method.