|Latin||Epithelium anterius corneae|
The corneal epithelium (epithelium corneæ anterior layer) is made up of epithelial tissue and covers the front of the cornea. It acts as a barrier to protect the cornea, resisting the free flow of fluids from the tears, and prevents bacteria from entering the epithelium and corneal stroma.
The corneal epithelium consists of several layers of cells. The cells of the deepest layer are columnar, known as basal cells which are attached by multiprotein complexes known as hemidesmosomes to an underlying basement membrane. Then follow two or three layers of polyhedral cells, commonly known as wing cells. The majority of these are prickle cells, similar to those found in the stratum mucosum of the cuticle. Lastly, there are three or four layers of squamous cells, with flattened nuclei. The layers of the epithelium are constantly undergoing mitosis. Basal and wing cells migrate to the anterior of the cornea, while squamous cells age and slough off into the tear film.
Central thickness of corneal epithelial layer is approximately 50 to 52 μm.
Cornea cell LASIK complication
Epithelial ingrowth is a LASIK complication in which cells from the cornea surface layer (epithelial cells) begin to grow underneath the corneal flap. Epithelial ingrowth is a rarely occurring LASIK complication, appearing in less than one percent of LASIK procedures. However, the incidence of epithelial ingrowth appears to be higher after subsequent enhancement LASIK procedures. This complication is not present in PRK or other non-flap vision correction procedures.
- John F, Salmon. "Eyelids". Kanski's Clinical ophthalmology (9 ed.). Elsevier. p. 204.
- Reinstein, Dan Z.; Archer, Timothy J.; Gobbe, Marine; Silverman, Ronald H.; Coleman, D. Jackson (2008). "Epithelial Thickness in the Normal Cornea: Three-dimensional Display With Very High Frequency Ultrasound". Journal of Refractive Surgery. 24 (6): 571–581. doi:10.3928/1081597X-20080601-05. ISSN 1081-597X. PMC 2592549. PMID 18581782.