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Abstract #24072 Published in IGR 11-3
Intraocular pressure changes during injection of microincision and conventional intraocular lenses through incisions smaller than 3.0 mm
Kamae KK; Werner L; Chang W; Johnson JT; Mamalis NJournal of Cataract and Refractive Surgery 2009; 35: 1430-1436
PURPOSE: To compare intraocular pressure (IOP) during insertion of a new microincision intraocular lens (IOL) (Akreos AO MI60) and a conventional IOL (AcrySof Natural SN60AT) and to determine the minimum incision sizes for insertion in a cadaver eye model. SETTING: John A. Moran Eye Center, University of Utah, Salt Lake City, Utah, USA. METHODS: After phacoemulsification in phakic cadaver eyes, multiple IOL insertions were attempted through 1.8 mm to 2.5 mm wounds. The final incision size and insertion success were evaluated in each case. A pressure transducer placed in the vitreous cavity measured real-time IOP changes (100 readings per second), including the mean and peak IOP during IOL implantation. RESULTS: The minimum incision size for the microincision IOL insertion was 1.9 mm using a wound-assisted technique and 2.2 mm using a cartridge-insertion technique. The minimum incision size for wound-assisted implantation of the conventional IOL was 2.4 mm. During successful implantation, the mean and peak IOPs were similar between the 2 IOL types. The peak IOPs exceeded 60 mmHg (retinal perfusion pressure). In unsuccessful attempts, the mean and peak IOPs were higher for the conventional IOL, reaching 306.05 mmHg in 1 eye. CONCLUSIONS: Monitoring during implantation of both IOL types confirmed that IOP increases during insertion, including during microincision surgery using a wound-assisted technique. Further studies are necessary to evaluate the effect of pressure spikes on the optic nerve during IOL insertion.
Dr. K.K. Kamae, John A Moran Eye Center, University of Utah, Salt Lake City, Utah 84132, USA. kandon.kamae@hsc.utah.edu
Classification:
12.12.3 Phacoemulsification (Part of: 12 Surgical treatment > 12.12 Cataract extraction)
