Ab interno sclerostomy with a high-powered argon endolaser

Area of Science:

• Ophthalmology
• Laser Surgery
• Glaucoma Research

Background:

• Elevated intraocular pressure (IOP) is a primary risk factor for glaucoma.
• Current glaucoma treatments aim to reduce IOP, but novel surgical approaches are continuously explored.
• Minimally invasive glaucoma surgery (MIGS) offers potential benefits for IOP management.

Purpose of the Study:

• To evaluate the efficacy of argon blue-green laser sclerostomies for IOP reduction in a rabbit model.
• To assess the safety and histopathological effects of the laser sclerostomy procedure.

Main Methods:

• Full-thickness sclerostomies were created using an ab interno approach with an argon blue-green laser in pigmented rabbits.
• Laser parameters included 1-4 pulses, 0.1-second pulse duration, and 5-14 W power via a 300-micron fiberoptic probe.
• Intraocular pressure was measured, and filtration bleb formation was assessed postoperatively. Histologic and radioautographic analyses were performed.

Main Results:

• Patent sclerostomies were successfully created in all 20 treated eyes without intraoperative complications.
• A significant average IOP decrease of 12 mm Hg was observed in treated eyes on postoperative day one, associated with filtration bleb formation.
• IOP returned to baseline levels by postoperative day four in 83% of animals, with bleb flattening. Histology confirmed focal tissue effects.

Conclusions:

• Argon blue-green laser sclerostomies can create patent openings and transiently reduce IOP in rabbits.
• The procedure appears safe with localized tissue effects, suggesting potential for further investigation in IOP management.
• The temporary IOP reduction highlights the dynamic nature of laser-induced filtration pathways.