Intact corneal epithelium is essential for the prevention of stromal haze after laser assisted in situ keratomileusis

Aims-To determine the effect of intact corneal epithelium on stromal haze a nd myofibroblast cell formation after excimer laser surgery. Methods-Denuded epithelium alone, photorefractive keratectomy (PRK), laser in situ keratomileusis (LASIK), or LASIK with denuded epithelium was perfor med in rabbit eyes. Postoperative anterior stromal haze was assessed employ ing a standard scale. Immunohistochemical methods were used to detect alpha smooth muscle actin (alpha -SMA), a marker for myofibroblastic cells, and type III collagen in subepithelial corneal tissue. Results-Three weeks after surgery, the presence of alpha -SMA positive long extended and spindle-shaped stromal cells, and synthesis of type III colla gen were observed in the subepithelial stromal layer corresponding to corne al haze in PRK and LASIK with denuded epithelium, but not in denuded epithe lium alone and LASIK. Conclusion-The intact corneal epithelium may play an important part curbing subepithelial haze and differentiation of myofibroblasts in corneal wound healing.