Aims To evaluate the efficacy of Fourier domain-optical coherence tomography (FD-OCT) in imaging and quantifying the limbal palisades of Vogt and to correlate these images with histological findings.
Methods The superior and inferior limbal region of both eyes of 50 healthy volunteers were imaged by FD-OCT. Images were processed and analysed using Matlab software. In vitro immunofluorescent staining of a cadaveric donor limbus was analysed to correlate the presence of stem cells in the visualised structures.
Results FD-OCT could successfully visualise limbal crypts and the palisades of Vogt in the limbus region. Fluorescent labelling confirmed the presence of stem cells in these structures. The mean palisade ridge width (ΔPR) and the mean interpalisade epithelial rete peg width (ΔERP) were both of the order of 72 μm, leading to a palisade density (PD) of about 7.4 palisades/mm. A significant difference in ΔPR, ΔERP and PD was seen between the inferior and superior sides of the right eye and the superior sides of the left and right eye(p<0.05.). A significant influence of iris colour on parameters ΔPR, ΔERP and PD was found, and of age on PD and ΔERP (p<0.05).
Conclusions In vivo OCT imaging is a safe and effective modality to image the limbus and can be used to visualise the palisades of Vogt. Image processing using Matlab software enabled quantification and density calculation of imaged limbal palisades of Vogt. This technique may enhance targeted limbal biopsies for transplantation.
- Stem Cells
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MH and JB contributed equally.
Contributors MH, JR, SND, M-JT and NZ contributed to the planning of this study. MH, JB, JR, VVG, SM and NZ contributed to the conduction of this study, whereas MH, JB, JR, SND and NZ significantly contributed to the reporting of the work.
Funding This research was funded by, Horizon2020 ARREST BLINDNESS, ‘Agentschap voor Innovatie door Wetenschap en Technologie—Toegepast Biomedisch onderzoek’ (IWT-TBM), and Funds for Research in Ophthalmology Belgium. Michel Haagdorens is a PhD student who holds a Research Foundation—Flanders scholarship.
Competing interests None declared.
Patient consent Obtained.
Ethics approval Ethisch Comité UZA.
Provenance and peer review Not commissioned; externally peer reviewed.
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