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Accuracy of intraocular lens calculations in infants and children undergoing cataract surgery
Daniel E Neely1, David A Plager, Sara M Borger
1Indiana University School of Medicine, Riley Hospital for Children, Indianapolis, IN 46202, USA.
Insights
Intraocular lens (IOL) calculations for pediatric cataract surgery show reasonable accuracy but significant variability. Older formulas performed similarly to newer ones, highlighting the need for careful consideration in young children.
Area of Science:
- Ophthalmology
- Pediatric Ophthalmology
- Biomedical Engineering
Background:
- Cataract extraction with intraocular lens (IOL) implantation is a common procedure in children.
- Accurate IOL power calculation is crucial for achieving optimal visual outcomes in pediatric patients.
Purpose of the Study:
- To evaluate the accuracy of intraocular lens (IOL) calculations in children undergoing cataract extraction.
- To compare the performance of different IOL calculation formulas in the pediatric population.
Main Methods:
- Retrospective review of 101 pediatric cataract extraction cases with posterior chamber IOL implantation.
- Analysis of IOL calculations using SRK II and SRK T formulas, with back-calculation for SRK II, SRK T, Holladay I, and Hoffer Q formulas.
- Comparison of preoperative predictive data with 2-month postoperative refractive results.
Main Results:
- The mean prediction error was 0.30 D, with significant variability (range -4.06 D to +3.86 D).
- Mean absolute prediction error was 1.16 D; SRK II and SRK T formulas showed no significant difference.
- Hoffer Q demonstrated the most variability, especially in children with axial lengths <19 mm.
Conclusions:
- Commonly used IOL calculation formulas provide generally reasonable but highly variable results in pediatric patients.
- Newer theoretical IOL calculation formulas did not outperform older regression models in this cohort.
Purpose:
We sought to evaluate the accuracy of intraocular lens calculations in children undergoing cataract extraction with intraocular lens (IOL) implantation.
Methods:
This was a retrospective review of 101 consecutive cases of pediatric cataract extraction with posterior chamber IOL. Median age at the time of surgery was 4.8 years, and 23 of the children were younger than 2 years of age. Initial IOL calculations were made using either the SRK II or SRK T formulas. Preoperative predictive data were compared with the refractive result obtained at the 2-month postoperative visit. Prediction error was calculated for each patient, and lens calculation errors were back-calculated for each of 4 commonly used IOL calculation formulas, including the SRK II, SRK T, Holladay I, and Hoffer Q.
Results:
The mean prediction error for all patients was 0.30 D. Despite this level of overall accuracy, significant variability did occur with outcomes ranging from -4.06 D to + 3.86 D of the desired spherical equivalent. Mean absolute prediction error was 1.16 D with no significant difference between the SRK II and SRK T formulas. Lens calculation errors predicted by each of the 4 formulas studied demonstrated a high degree of variability with the SRK II being the least variable and the Hoffer Q being the most variable, particularly among the youngest group of children with the axial lengths less than 19 mm.
Conclusions:
The accuracy of commonly used IOL calculation formulas is generally reasonable but highly variable within the pediatric population, Newer theoretic IOL calculation formulas did not outperform older regression models.