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Ocular refraction and its components among younger children in Kaohsiung: a 4-year longitudinal study
1Department of Ophthalmology, Kaohsiung Medical College, Taiwan, Republic of China.
Insights
This four-year study tracked 50 children
Area of Science:
- Ophthalmology and Vision Science
- Pediatric Eye Health
- Longitudinal Research Methods
Background:
- Childhood myopia is a growing concern globally.
- Understanding refractive error progression in children is crucial for early intervention.
- Longitudinal data provides valuable insights into ocular development.
Purpose of the Study:
- To investigate the longitudinal changes in refractive state and its components in children.
- To identify factors influencing refractive development over a four-year period.
- To compare refractive component changes between genders.
Main Methods:
- A four-year longitudinal study involving 50 children aged 7 to 10.6 years.
- Standardized eye examinations including Mydriacyl refraction and keratometry.
- Ultrasonic biometry for measuring refractive components like axial length and lens thickness.
Main Results:
- A significant shift towards myopia was observed, with the myopia rate increasing from 2% to 27.3%.
- Increases in ocular refractive power, vitreous cavity length, and total axial length were noted.
- Corneal refractive power and lens thickness decreased significantly; males exhibited larger axial lengths and corneal radii.
Conclusions:
- Childhood myopia progression is a significant concern, with rapid increases observed in this cohort.
- Axial length and corneal curvature are key determinants of refractive state in young children.
- Gender differences in ocular parameters persist during childhood development.
Abstract:
A four-year longitudinal study was made on refraction and its components among 50 children of Kaohsiung, Taiwan, R.O.C. aged from 7 to 10.6 years. The methods of examination of the eyes were the same as that of four years ago, including Mydriacyl refraction, keratometry for corneal curvature radius, and ultrasonic measurement of the refractive components. One eye with amblyopia was excluded. The results of our study showed that all of our cases over 6 years of age had a corrected visual acuity of 0.8 or better, and that the refractive state shifted to myopia in our 4-year follow up. The rate of myopia increased from 2% to 27.3%. Comparisons of refractive components between the years 1983 and 1987 showed significant increases in refractive power, length of vitreous cavity and total axial length of the eyes. Corneal refractive power and lens thickness, however decreased significantly. As for differences in gender, several results were the same for both 1983 and 1987: corneal curvature radius, the length from anterior corneal surface to anterior lens surface, length of vitreous cavity and total axial length were larger in males than females. Finally, total axial length and corneal curvature radius were the factors most affecting the refractive state in younger children.