Morphometric differences in normal bony nasolacrimal anatomy: comparison between four ethnic groups.

Area of Science:

• Anatomy
• Ophthalmology
• Medical Imaging

Background:

• The nasolacrimal duct (NLD) anatomy can vary significantly across different ethnic populations.
• Understanding these variations is crucial for diagnosing and managing NLD obstructions.

Purpose of the Study:

• To compare the bony nasolacrimal duct anatomy across four distinct ethnic groups.
• Investigate potential ethnic-based differences in NLD dimensions.

Main Methods:

• Retrospective observational study utilizing high-resolution CT scans of 154 patients.
• Included normal nasolacrimal ducts from European, South Asian, Afro-Caribbean, and Oriental ethnic groups.
• Measurements of the bony nasolacrimal duct and surrounding structures were performed.

Main Results:

• Nasolacrimal ducts in the Afro-Caribbean group were wider and shorter than European.
• Oriental nasolacrimal ducts were wider and longer compared to European.
• No significant differences were observed between South Asian and European nasolacrimal ducts.

Conclusions:

• The bony nasolacrimal duct exhibits greater calibre (inner diameter) in individuals of Afro-Caribbean or Oriental origin compared to European or South Asian.
• These anatomical differences may predispose Afro-Caribbean and Oriental patients to secondary causes of acquired nasolacrimal duct obstruction.