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Normal eye growth in emmetropic schoolchildren.
Karla Zadnik1, Donald O Mutti, G Lynn Mitchell
1The Ohio State University College of Optometry, Columbus, Ohio 43210-1240, USA. zadnik.4@osu.edu
Summary
Normal eye growth in children aged 6-15 involves axial elongation and changes in optical components. Key findings show crystalline lens flattening, thinning, and decreased power, alongside corneal power changes.
Area of Science:
- Ophthalmology
- Pediatric Ophthalmology
- Optometry
Background:
- Understanding normal ocular development is crucial for identifying deviations.
- Emmetropia, or normal vision, is characterized by specific refractive error ranges.
- Longitudinal studies provide valuable insights into growth patterns.
Purpose of the Study:
- To characterize the normal growth trajectory of ocular optical components in emmetropic school-aged children.
- To establish normative data for eye growth in a pediatric cohort.
Main Methods:
- Emmetropia defined as refractive error between +1.00 D and -0.25 D.
- Data from 194 children (ages 6-14) in the Orinda Longitudinal Study of Myopia (OLSM).
- Measurements included axial length, corneal power, anterior chamber depth, and lens parameters over 3 annual visits.
Main Results:
- Axial length, anterior chamber depth, and vitreous chamber depth increased with age.
- Corneal power and anterior chamber depth followed quadratic growth patterns.
- Lens power decreased with age, with lens thickness and index showing complex age-related changes.
Conclusions:
- Normal eye growth in emmetropic children (ages 6-15) is characterized by axial elongation.
- Hallmarks include crystalline lens flattening, thinning, and a reduction in lens power.
- The study provides a comprehensive view of ocular component development during childhood.