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Anterior chamber stability of a novel phacoemulsification machine through the slit side view method
Hisaharu Suzuki1, Mai Kurose, Takashi Horie
1From the Zengyo Suzuki Eye Clinic, Kanagawa, Japan; Alcon Japan Ltd., Tokyo, Japan (Kurose, Horie); Alcon Research LLC, Fort Worth, Texas (Makari, Yalamanchili).
Purpose:
To evaluate anterior chamber (AC) stability of the UNITY Vitreoretinal Cataract System (UVCS) compared with the Centurion Vision System with ACTIVE SENTRY (CAS) using the slit side view (SSV) technique during a simulated occlusion break event.
Setting:
Zengyo Suzuki Eye Clinic, Kanagawa, Japan.
Design:
Experimental study.
Methods:
10 porcine eyes underwent testing with UVCS and CAS at intraocular pressures (IOPs) of 20, 30, and 40 mm Hg; vacuum limits of 550, 600, and 650 mm Hg; and an aspiration flow rate of 40 mL/min. Eyes with 2.4 mm incision were transferred to slitlamp. Continuous irrigation stabilized IOP before occlusion break which was simulated thrice. IOP changes and SSV images were recorded determining AC depth (ACD) changes, surge duration, and volume during an occlusion break event.
Results:
ACD change was significantly less with UVCS compared with CAS (0.15 ± 0.06 vs 0.43 ± 0.14 mm, P < .001). During occlusion break, minimum IOP was closer to baseline with UVCS vs CAS (19.1 ± 5.9 vs 26.9 ± 6.3 mm Hg, P < .001). Postocclusion break surge volume and duration were minimal with UVCS vs CAS ( P < .001), with mean recovery time ≤ 0.17 seconds with UVCS.
Conclusions:
UVCS maintained AC stability better than CAS during simulated occlusion break testing which may improve clinical outcomes, surgeon confidence to operate at lower IOP. Recovering from postocclusion break surge faster than reported human reaction times suggested UVCS compensated for fluctuations faster than the surgeon can react.
