INTRAOCULAR PRESSURE CHANGES DURING VITRECTOMY USING CONSTELLATION VISION SYSTEM'S INTRAOCULAR PRESSURE CONTROL...

Area of Science:

• Ophthalmology
• Surgical Technology

Background:

• Maintaining stable intraocular pressure (IOP) is crucial during vitrectomy.
• The Constellation Vision System offers an intraocular pressure control (IOPc) feature to aid in pressure management.

Purpose of the Study:

• To assess IOP fluctuations during experimental vitrectomy.
• To evaluate the efficacy of the Constellation Vision System's IOPc feature in maintaining baseline IOP.

Main Methods:

• Porcine eyes were used to test 23- and 25-gauge vitrectomy probes.
• Intraocular pressure was monitored with a pressure transducer with IOPc activated and deactivated across various settings.

Main Results:

• IOPc significantly improved IOP stability compared to when it was off.
• The 23-gauge system showed less IOP drop (average 12.79 mmHg) than the 25-gauge system (average 21.17 mmHg).
• Both systems reestablished baseline IOP within approximately 1.6 seconds, with some overshooting observed.

Conclusions:

• The IOPc feature effectively reestablished and sustained baseline infusion pressures with both 23- and 25-gauge probes.
• The 23-gauge probes resulted in less IOP fluctuation during vitrectomy compared to 25-gauge probes.