Related Experiment Video
Updated: Jun 22, 2026
Ex Vivo Corneal Organ Culture Model for Wound Healing Studies
Published on: February 15, 2019
Corneal molecular and cellular biology update for the refractive surgeon
Marcella Q Salomao1, Steven E Wilson
1The Cole Eye Institute, Cleveland Clinic, Cleveland, Ohio 44195, USA.
Purpose:
To review clinically relevant progress in understanding cellular and molecular interactions in the cornea that relate to refractive surgical outcomes in patients.
Methods:
Recent published literature focused on femtosecond LASIK and surface ablation procedures, such as photorefractive keratectomy, was reviewed and correlated with clinical results of surgery.
Results:
The femtosecond laser has a direct necrotic effect on stromal keratocytes, resulting in the release of cellular components that are chemotactic to bone marrow-derived inflammatory cells. Developments of the femtosecond laser led to lower energy delivery to the stroma and altered laser ablation profiles that decrease epithelial damage during the side-cut, and have markedly improved femtosecond LASIK to the point that the overall early postoperative healing response is indistinguishable from microkeratome LASIK. New studies have directly demonstrated the importance of surface irregularity and resulting structural and functional defects in the epithelial basement membrane, in the generation and persistence of anterior stromal myofibroblasts and haze following surface ablation procedures. These defects augment penetration of epithelium-derived TGF-beta, which is a critical modulator of myofibroblast development in the stroma. Studies on the mechanism of action of mitomycin C treatment to prevent haze have confirmed that the most powerful effect is on stromal cell proliferation and, therefore, decreased population of the anterior stroma with myofibroblast progenitor cells. An undesirable long-term effect of mitomycin C is diminished anterior stromal keratocyte density due to diminished keratocyte re-population. This raises concerns regarding future corneal anomalies in treated corneas.
Conclusions:
Basic research studies of refractive procedures provide important insights into the effects of wound healing on surgical outcomes.
Insights
Understanding corneal cell interactions after refractive surgery like LASIK is key. Femtosecond laser LASIK shows improved healing, while surface ablation can cause haze due to epithelial defects and myofibroblast activation.
Area of Science:
- Ophthalmology
- Corneal Biology
- Laser Surgery
Background:
- Refractive surgery outcomes are influenced by cellular and molecular responses within the cornea.
- Understanding these interactions is crucial for improving patient results.
Purpose of the Study:
- To review clinical progress in understanding cellular and molecular interactions in the cornea related to refractive surgical outcomes.
- Focus on femtosecond LASIK and surface ablation procedures.
Main Methods:
- Review of recent published literature on femtosecond LASIK and surface ablation (e.g., photorefractive keratectomy).
- Correlation of findings with clinical surgical results.
Main Results:
- Femtosecond laser causes keratocyte necrosis, attracting inflammatory cells; newer techniques improve healing.
- Surface ablation defects in the epithelial basement membrane promote myofibroblasts and haze via TGF-beta.
- Mitomycin C prevents haze by inhibiting proliferation but reduces keratocyte density, raising long-term concerns.
Conclusions:
- Basic research on refractive procedures offers vital insights into wound healing's impact on surgical outcomes.
- Continued investigation into cellular mechanisms is essential for advancing refractive surgery safety and efficacy.
