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Corneal epithelial permeability: ethnic differences between Asians and non-Asians
Wing Y Li1, Carol Hsiao, Andrew D Graham
1Clinical Research Center, School of Optometry, University of California, Berkeley, CA, USA.
Summary
Asians have a more permeable corneal epithelium than non-Asians, indicated by higher fluorescein permeability (Pdc) measurements. This difference may be linked to anatomical variations, such as increased eyelid tension in Asians.
Area of Science:
- Ophthalmology
- Corneal Physiology
- Human Anatomy
Background:
- Corneal epithelial permeability is crucial for ocular health and drug delivery.
- Understanding ethnic variations in corneal properties can inform clinical practice.
Purpose of the Study:
- To investigate potential differences in corneal epithelial permeability to fluorescein (Pdc) between Asian and non-Asian populations.
Main Methods:
- Analysis of 632 baseline Pdc measurements from 176 subjects in a multi-study database.
- Inclusion criteria: awake for ≥4 hours, no ocular disease, no central corneal staining.
- Pdc data log-transformed for statistical analysis.
Main Results:
- Asian subjects demonstrated a significantly higher mean natural logarithm of Pdc (ln(Pdc)) compared to non-Asian subjects.
- Mean ln(Pdc) values were -2.34 ln(nm/s) for Asians versus -2.58 ln(nm/s) for non-Asians (p<0.001).
Conclusions:
- Asians exhibit a more permeable corneal epithelium than non-Asians, evidenced by a higher Pdc.
- This increased permeability may be associated with anatomical differences, potentially including greater eyelid tension in Asians.
