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Subsurface photodisruption in human sclera: wavelength dependence
Zachary S Sacks1, Ronald M Kurtz, Tibor Juhasz
1Center for Ultrafast Science, University of Michigan, Ann Arbor, USA.
Summary
Femtosecond lasers can now create precise subsurface incisions in human sclera, overcoming scattering issues. This breakthrough in glaucoma surgery may reduce failures caused by tissue scarring.
Area of Science:
- Ophthalmology
- Biomedical Engineering
- Laser Physics
Background:
- Glaucoma affects over 105 million people globally, with 5 million blind from complications.
- Current glaucoma surgeries often fail due to conjunctival and Tenon's tissue scarring.
- Femtosecond lasers excel at precise subsurface tissue incisions, as seen in corneal surgery.
Purpose of the Study:
- To investigate the feasibility of using femtosecond lasers for subsurface photodisruption in human sclera.
- To overcome the challenge of light scattering in the sclera, which previously hindered laser applications.
Main Methods:
- Utilized a 1,700 nm laser for photodisruption to create subsurface cuts in human sclera.
- Conducted experiments in vitro on human sclera tissue.
Main Results:
- Successfully created incisions less than 10 micrometers wide beneath the scleral surface.
- Achieved incisions without collateral tissue damage, unlike shorter wavelength lasers used in corneal applications.
- Demonstrated that photodisruption is possible in the highly scattering scleral tissue.
Conclusions:
- Completely subsurface photodisruptions are achievable in human sclera in vitro using a 1,700 nm femtosecond laser.
- Further in vivo studies are necessary to explore the clinical potential for glaucoma surgery and other scleral applications.