Intraocular microsurgery with a picosecond Nd:YAG laser

Area of Science:

• Ophthalmology
• Laser Microsurgery
• Biomedical Optics

Background:

• Conventional nanosecond photodisruptors require high pulse energies for intraocular surgery.
• High pulse energies can lead to significant collateral tissue damage, posing risks to sensitive ocular structures like the retina.

Purpose of the Study:

• To investigate the efficacy and safety of picosecond Nd:YAG laser pulses for intraocular microsurgery.
• To evaluate the potential of reduced pulse energy and improved axial confinement for precise surgical applications.

Main Methods:

• Utilized 100-picosecond Nd:YAG laser pulses with an energy of 70 microJoules.
• Developed an in vitro model to assess the axial confinement of picosecond laser-induced optical breakdown.
• Performed in vivo vitreous membrane surgery in rabbit eyes.

Main Results:

• Achieved consistent optical breakdown in the deep vitreous with significantly lower pulse energy (70 microJ) compared to nanosecond lasers.
• Demonstrated a smaller zone of tissue damage due to reduced pulse energy.
• Showcased efficient cutting action using multiple pulses at a repetition rate of 50-200 Hz.

Conclusions:

• Picosecond laser pulses represent a promising advancement for intraocular microsurgery, offering enhanced safety through reduced tissue damage.
• The precise optical breakdown and minimal collateral effects make picosecond lasers suitable for delicate ophthalmic procedures.
• In vivo studies confirm the potential clinical applicability of picosecond laser-induced optical breakdown in vitreous surgery.