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Epithelial Thinning in Limbal Stem Cell Deficiency.
Eric H Chan1, Luxia Chen2, Fei Yu3
1Cornea Division, Stein Eye Institute, University of California, Los Angeles, Los Angeles, California; David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, California.
American Journal of Ophthalmology
|July 12, 2015
Summary
Limbal stem cell deficiency (LSCD) causes progressive thinning of the corneal and limbal epithelia. Epithelial thickness measurements can help diagnose LSCD and assess its severity.
Area of Science:
- Ophthalmology
- Regenerative Medicine
- Corneal Biology
Background:
- Limbal stem cell deficiency (LSCD) is a sight-threatening condition affecting the ocular surface.
- The limbus harbors stem cells crucial for corneal epithelial maintenance and regeneration.
- Understanding epithelial changes in LSCD is vital for diagnosis and treatment.
Purpose of the Study:
- To quantify epithelial thickness in the cornea and limbus of patients with LSCD.
- To compare epithelial thickness in LSCD patients with healthy controls.
- To correlate epithelial thickness with the clinical stage of LSCD.
Main Methods:
- A cross-sectional comparative study involving 48 eyes of 35 LSCD patients and 11 healthy controls.
- In vivo laser scanning confocal microscopy (Heidelberg Retina Tomograph III Rostock Corneal Module) was used.
- Epithelial thickness of the central cornea and all four quadrants of the limbus was measured by two independent observers.
Main Results:
- LSCD patients showed significantly reduced epithelial thickness in both the central cornea (20.2% reduction) and limbus (38.5% reduction) compared to controls.
- Epithelial thinning was progressive, correlating with LSCD severity across early, intermediate, and late stages.
- Even clinically unaffected limbal regions exhibited epithelial thinning in sectoral LSCD cases.
Conclusions:
- Both corneal and limbal epithelial layers progressively thin in limbal stem cell deficiency.
- Epithelial thickness serves as a quantifiable diagnostic marker for LSCD.
- In vivo confocal microscopy is a valuable tool for assessing epithelial changes in LSCD.
