Relationship between vessel diameter and depth measurements within the limbus using ultra-high resolution optical...

Area of Science:

• Ophthalmology
• Biomedical Imaging
• Microcirculation Research

Background:

• The corneo-scleral limbus is a critical interface in ocular health.
• Understanding limbal vasculature is essential for diagnosing and managing ocular conditions.
• Previous imaging techniques had limitations in resolving fine vascular details in the limbus.

Purpose of the Study:

• To investigate the relationship between vessel diameter and depth in the superior and inferior corneo-scleral limbus.
• To utilize ultra-high resolution optical coherence tomography (UHR-OCT) for precise morphometric analysis of limbal vessels.
• To compare vascular characteristics between the superior and inferior limbus in healthy subjects.

Main Methods:

• Acquisition of volumetric UHR-OCT images of the superior and inferior limbus from 14 healthy individuals.
• Quantitative analysis of vessel diameter and depth using statistical methods (repeated measures ANOVA).
• Assessment of the correlation between limbal vessel depth and size.

Main Results:

• Superior limbal vessels were significantly larger (mean 29±18μm) than inferior vessels (mean 24±18μm; p=0.004).
• Inferior limbal vessels were significantly deeper (mean 207±132μm) than superior vessels (mean 177±109μm; p=0.041).
• A positive linear association was observed between limbal vessel depth and size in both superior (r=0.803) and inferior (r=0.754) regions.

Conclusions:

• UHR-OCT is a capable tool for imaging and quantifying limbal vessel morphometrics.
• Significant differences in size and depth exist between superior and inferior limbal vessels.
• These vascular variations may reflect adaptations to hypoxia, and UHR-OCT could assess contact lens effects on limbal microvasculature.