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In-vivo response to free electron laser incision of the rabbit cornea
C A Toth1, E K Chiu, K P Winter
1Duke University Medical Center, Department of Opthalmology, Durham, North Carolina 27710, USA. toth004@mc.duke.edu
Background And Objective:
We analyzed the in vivo ocular response to corneal incisions made by Medical Free Electron Laser (MFEL) as a function of scan rate and incision depth. Additionally, we compared biomicroscopy, optical coherence tomography (OCT), and light microscopy as ocular response diagnostic tools.
Study Design/Materials And Methods:
Rabbit corneas were incised with pulsed MFEL radiation at 2.94 microm wavelength, scalpel incisions or focal cautery treatment were used as controls. The MFEL beam scan rate ranged from 0.2 to 1.0 mm/second. Ocular effects were monitored for 2 hours postoperatively using OCT and slit lamp examination. Ocular tissue was fixed for light microscopic examination.
Results:
Anterior chamber fibrin formation correlated with MFEL incision depth. Slower scan rates resulted in deeper incisions and greater fibrin formation. OCT was better than slit lamp biomicroscopy at identifying fibrin attachments. OCT and light microscopy proved to be excellent companion technologies.
Conclusions:
Deep corneal incisions in the rabbit produced by the MFEL resulted in fibrin formation in the anterior chamber.
Insights
Medical Free Electron Laser (MFEL) corneal incisions in rabbits caused anterior chamber fibrin. Deeper incisions and slower scan rates increased fibrin, with OCT and light microscopy proving effective diagnostic tools.
Area of Science:
- Ophthalmology
- Biomedical Engineering
- Laser Medicine
Background:
- Corneal incisions are common in ophthalmic surgery.
- Evaluating novel laser technologies for corneal surgery is crucial.
- Understanding the in vivo ocular response to laser-induced incisions is important.
Purpose of the Study:
- To analyze the in vivo ocular response to Medical Free Electron Laser (MFEL) corneal incisions.
- To investigate the effect of scan rate and incision depth on ocular response.
- To compare diagnostic tools for assessing ocular response to corneal incisions.
Main Methods:
- Rabbit corneas were incised using a pulsed MFEL (2.94 microm wavelength).
- Incisions were made at varying scan rates (0.2-1.0 mm/second) and depths.
- Ocular response was monitored using optical coherence tomography (OCT), slit lamp examination, and light microscopy.
Main Results:
- Anterior chamber fibrin formation correlated with MFEL incision depth.
- Slower MFEL scan rates led to deeper incisions and increased fibrin.
- OCT demonstrated superior fibrin detection compared to slit lamp biomicroscopy.
Conclusions:
- Deep corneal incisions created by MFEL in rabbits resulted in anterior chamber fibrin formation.
- MFEL incision depth and scan rate are critical factors influencing ocular response.
- OCT and light microscopy are valuable tools for evaluating laser-induced corneal injuries.