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Dimensions of the pediatric crystalline lens: implications for intraocular lenses in children
E C Bluestein1, M E Wilson, X H Wang
1N. Edgar Miles Center for Pediatric Ophthalmology, Storm Eye Institute, Charleston, SC, USA.
Insights
Accurate sizing of pediatric intraocular lenses (IOLs) requires understanding capsular bag size. This study developed a growth curve for pediatric crystalline lenses and capsular bags, aiding in IOL design for children.
Area of Science:
- Ophthalmology
- Pediatric Ophthalmology
- Biometry
Background:
- Posterior chamber intraocular lens (IOL) implantation in children is becoming more common.
- Accurate IOL sizing for in-the-bag fixation in pediatric patients is crucial.
- Understanding the growth of the crystalline lens and capsular bag is essential for pediatric IOL selection.
Purpose of the Study:
- To develop a growth curve for the normal crystalline lens in children.
- To determine the corresponding capsular bag size in pediatric eyes.
- To provide data for designing appropriate IOLs for pediatric patients.
Main Methods:
- Analysis of 50 pediatric autopsy eyes (1 day to 16 years old).
- Measurement of crystalline lens diameter within 24 hours postmortem.
- Calculation of capsular bag size (1 mm larger than lens diameter).
- Development of linear regressions correlating age, corneal diameter, and axial length with lens size.
Main Results:
- Mean crystalline lens diameter ranged from 6.00 mm at birth to 9.3 mm at 16 years.
- Capsular bag size was consistently 1 mm larger than the crystalline lens.
- Corneal diameter and globe axial length were better predictors of lens size than age alone.
Conclusions:
- The developed growth curves provide valuable data for pediatric IOL sizing.
- Corneal diameter and axial length are key biometric parameters for pediatric IOL selection.
- This research supports the design of more accurate IOLs for pediatric intraocular lens implantation.
Abstract:
As surgeons gain more experience with the implantation of posterior chamber intraocular lenses (IOLs) into the capsular bag in children, the minimum age for which implantation is advised may continue to be lowered. Accurate sizing of an IOL intended for in-the-bag fixation may depend on knowledge of the size of the capsular bag. In order to develop a growth curve for the normal crystalline lens and hence the capsular bag, 50 pediatric autopsy eyes ranging in age from 1 day to 16 years were obtained postmortem and measured within 24 hours after enucleation. Mean crystalline lens diameter was 6.00 mm at birth, 6.80 mm at 2 months, 7.1 mm at 3 months, 7.66 mm at 6 to 9 months, 8.4 mm at 21 months, 8.5 mm at 2 to 5 years, and 9.3 mm at 16 years. The post-lensectomy capsular bag size at each respective age is 1 mm larger. While age was a predictor of crystalline lens size, corneal diameter and globe axial length were better predictors of crystalline lens size. These data and accompanying linear regressions may be helpful in designing appropriate IOLs for pediatric patients.