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Timed biomicroscopy of rabbit corneal wound repair
J N Fernandez del Cotero1, S Bonafonte, A Aguirre Vila-Coro
1University of Texas Health Science Center, Houston.
Abstract:
Central, full-thickness excisional wounds were made in rabbit corneas to evaluate the biomicroscopic changes during the scarring process. Within the first minutes, the wound is closed with a fibrin clot. A timely microscopic study was performed in 10 rabbits (group A) during the first minutes after surgery to study the morphological changes in fibrin clot formation. A lid speculum was used for lid retraction to continuously expose the eyes. The fibrin clot formed in the first minutes between the wound edges and grew progressively. Subsequent breaks and reconstruction of the clot occurred. With this method, a permanent wound closure did not occur in any of the 10 eyes during the first 90 min. Twenty more rabbits (group B) were used to study the wound repair in more physiological conditions without lid retraction. Microphotographs were obtained at 6 and 12 h, and at 1, 2, 7, 30 and 90 days after surgery. Three months after the procedure, the appearance of the cornea was stable, with a thick leukoma occupying the lesioned area.
Insights
Rabbit corneal wounds initially close with a fibrin clot, but this closure is temporary. Long-term healing results in a stable cornea with significant scarring, forming a leukoma.
Area of Science:
- Ophthalmology
- Wound Healing
- Biomaterials
Background:
- Corneal wounds require effective closure mechanisms for healing.
- Fibrin clot formation is an initial step in wound repair.
- Understanding the dynamics of corneal wound healing is crucial for developing therapeutic strategies.
Purpose of the Study:
- To investigate the biomicroscopic changes during the corneal scarring process in rabbits.
- To analyze the morphological changes and stability of fibrin clot formation in the initial minutes after corneal wounding.
- To evaluate long-term corneal wound repair under physiological conditions.
Main Methods:
- Central, full-thickness excisional corneal wounds were created in rabbits.
- Group A (n=10) underwent microscopic study of fibrin clot formation within 90 minutes, with lid retraction.
- Group B (n=20) were observed for wound repair under physiological conditions (no lid retraction) with imaging at multiple time points up to 90 days.
Main Results:
- Fibrin clot formation occurred rapidly but was dynamic, with breaks and reconstruction observed.
- Permanent wound closure was not achieved within 90 minutes in Group A.
- By 90 days post-surgery, corneas in Group B showed stable appearance with a significant leukoma in the lesioned area.
Conclusions:
- Initial fibrin clot closure of corneal wounds is transient.
- Corneal wound healing in rabbits, even without prolonged disruption, leads to substantial scarring (leukoma) over three months.
- The study highlights the complex nature of corneal wound healing and the potential for persistent opacity.