Picosecond neodymium:yttrium lithium fluoride laser sclerectomy

Area of Science:

• Ophthalmology
• Laser Surgery
• Histology

Background:

• Glaucoma surgery often involves creating scleral flaps or openings.
• Minimizing thermal damage during laser-assisted ocular surgery is crucial for patient outcomes.
• The neodymium:yttrium lithium fluoride laser offers high power and short pulse durations for precise tissue interaction.

Purpose of the Study:

• To evaluate the efficacy of a picosecond neodymium:yttrium lithium fluoride laser for performing ab externo sclerectomies.
• To determine optimal laser settings for full-thickness scleral perforation with minimal thermal injury.
• To assess the penetration depth and thermal damage associated with laser sclerectomy.

Main Methods:

• Human cadaver eyes were used for ab externo sclerectomy procedures.
• Various laser parameters were tested, including energy per pulse, depth per burst, spot/line separation, and total energy.
• Histologic examination of sclerectomy sites was performed to quantify thermal damage.

Main Results:

• The picosecond neodymium:yttrium lithium fluoride laser successfully performed full-thickness sclerectomies.
• Anterior chamber penetration was achieved with an average total energy of 13.3 J.
• Minimal thermal damage (3-5 microns) to surrounding scleral tissue was observed with 250 microJ per pulse.

Conclusions:

• The picosecond neodymium:yttrium lithium fluoride laser is an effective tool for performing full-thickness sclerectomies.
• The laser allows for precise tissue ablation with limited collateral thermal effects.
• This laser technology shows promise for ophthalmic surgical applications requiring scleral penetration.