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Measuring red blood cell shape in the human retina
Optics Letters
|May 24, 2023
Summary
Red blood cells deform significantly in narrow retinal capillaries. This study reveals how their shape and orientation change in vivo, offering new insights into blood flow dynamics.
Area of Science:
- Ophthalmology
- Biomedical Engineering
- Physiology
Background:
- Red blood cell (RBC) deformation is crucial for navigating narrow capillaries.
- In vivo RBC deformation in human retinal capillaries remains poorly understood due to observational challenges.
Purpose of the Study:
- To develop a noninvasive method for studying RBC shape in living human retinal capillaries.
- To characterize RBC deformation and orientation within varying capillary diameters.
Main Methods:
- Utilized high-speed adaptive optics for in vivo imaging of retinal microvasculature.
- Employed motion compensation and time-averaged image analysis to visualize RBC flow.
- Analyzed RBC geometry and orientation in 123 capillary vessels across three healthy subjects.
Main Results:
- Observed diverse RBC geometries in capillaries ranging from 3.2 to 8.4 µm.
- Found RBCs transition to more elongated shapes and align with flow in narrower vessels.
- Noted that RBCs frequently maintained an oblique orientation relative to the capillary axis.
Conclusions:
- The novel adaptive optics method enables noninvasive in vivo study of RBC deformation in retinal capillaries.
- RBC shape and orientation are dynamically adjusted to vessel diameter, impacting microcirculatory function.
- Findings provide critical data on cellular mechanics within the human microvasculature.
