Wang-Koch Adjustment (SRK/T)
Optimizes axial length for eyes > 25.0mm (SRK/T 2018 version).
This calculator is a support tool intended exclusively for health professionals. It does not replace clinical judgment. The final decision regarding diagnosis and treatment is the sole responsibility of the professional.
Patient Data
Result
Fill in all required fields to see the result
About this Calculator 💡
The Wang-Koch Adjustment (2018 version for SRK/T) is a mathematical update proposed by Drs. Wang and Koch to refine intraocular lens calculations in eyes with high myopia (> 25.0 mm). Unlike the original 2011 formula (focused on Holladay 1), this 2018 version applies specific regression coefficients intended for use with the SRK/T formula. In long eyes, SRK/T tends to overestimate lens power, leading to hyperopic errors; this adjustment reduces the measured axial length to an 'optimized axial length,' mitigating this risk. This tool should be used exclusively in conjunction with the SRK/T formula.
Reference Values
- • Optimized AL. Use this value specifically in the SRK/T formula.
- • Attention: This 2018 adjustment is intended for eyes with AL > 25.0 mm.
Formula
AL_opt = 0.8453 × AL_measured + 4.0773
Reference
Wang L, Koch DD. Modified axial length adjustment formulas in long eyes. J Cataract Refract Surg. 2018.