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Orbital development in Hong Kong Chinese subjects
Anson Chau1, Karl Fung, Lawrance Yip
1Centre for Myopia Research, Department of Optometry and Radiography, The Hong Kong Polytechnic University, Hong Kong, China.
Summary
Orbital volume in Hong Kong Chinese individuals grows rapidly in early childhood, reaching adult size around age 16. This study tracked orbital development from infancy to adulthood using MRI scans.
Area of Science:
- Ophthalmology
- Anthropometry
- Human Anatomy
Background:
- Understanding orbital development is crucial for diagnosing congenital conditions and planning reconstructive surgery.
- Normative data for orbital growth in specific populations, like Hong Kong Chinese, is limited.
- Previous studies often lack detailed volumetric analysis across a wide age range.
Purpose of the Study:
- To investigate the normative development of orbital volume in Hong Kong Chinese subjects.
- To establish reference ranges for orbital volume from infancy through adulthood.
- To analyze the growth trajectory of the orbit in this specific demographic.
Main Methods:
- Magnetic resonance imaging (MRI) was used to acquire detailed orbital measurements.
- A cohort of 81 Hong Kong Chinese subjects, aged 1 to 42 years, was included.
- Orbit volume was calculated from the 3D MRI data.
Main Results:
- Orbital volume ranged from 11.56 to 25.50 cm³.
- Rapid orbital growth occurred in the first three years of life, with mean volumes of 12.36 cm³ (1 year) and 15.31 cm³ (1-3 years).
- Growth steadily continued until approximately 16 years of age, reaching a mean volume of 21.00 cm³.
Conclusions:
- The study provides normative data for orbital volume development in Hong Kong Chinese.
- Orbital growth demonstrates a distinct pattern, with rapid early development and stabilization in adolescence.
- These findings are valuable for clinical assessments and research in craniofacial development.