Use of the aphakic refraction in intraocular lens (IOL) power calculations for secondary IOLs in pediatric patients.
OBJECTIVE
Calculating the power of a secondary intraocular lens (IOL) requires axial lengths and keratometry measurements. In children, these measurements often need to be done under either sedation at the time of surgery or additional sedation. We devised a method of calculating IOL power using only the aphakic refraction and a standard keratometry value.


METHODS
This retrospective study included children undergoing a secondary IOL procedure who had IOL calculations based on either a measured axial length and a measured keratometry value (with sedation if needed) or a calculated axial length and a standard keratometry value. Comparison of predicted postoperative refraction with actual postoperative refraction was used to evaluate each method.


RESULTS
The mean difference between predicted and actual postoperative refractions was 2.34 D for the group with actual measurements and 2.50 D for the group with the calculated value method.


CONCLUSIONS
The use of the aphakic refraction to calculate axial length and a standard keratometry value provides an alternative for secondary IOL calculations in pediatric patients when ultrasonic or nonsedated ultrasonic axial length measurements are not an option.
Children's Mercy Hospital, Kansas City, Missouri, USA.
Timothy
T
Hug
D000293:Adolescent; D001036:Aphakia, Postcataract / Q000601:surgery*; D002648:Child; D002675:Child, Preschool; D006801:Humans; D007223:Infant; D019654:Lens Implantation, Intraocular; D007910:Lenses, Intraocular; D008433:Mathematics; D055095:Optics and Photonics; D012029:Refraction, Ocular; D012189:Retrospective Studies