97th DOG Annual Meeting 1999
RETENTION AND REMOVAL OF DISPERSIVE AND COHESIVE VISCOELASTICS (VISCOAT® AND PROVISC®)
G. U. Auffarth1,2, D. J. Apple2, R. Schoderbek2, S. Pandey2, H. E. Völcker1
Background: Disperive and cohesive viscoelastics have principally different physico-chemical properties.
Methods: In a standardized laboratory set up we used the Miyake posterior view video technique in human autopsy eyes to evaluate removal of cohesive (=ProVisc®) and dispersive (Viscoat®) flourescein stained viscoelastics from the capsular bag with 5 different IOLs (1xPMMA, 3xSilicone and 1xAcrylic IOL). The open sky preparation and an Alcon Legacy Series 2000 phaco-machine with a flow rate of 25ml/min and vacuum setting of +500mmHg (I/A Max) was used. In addition retention of viscoat in the anterior chamber during phacoemulsification was evaluated.
Results: Viscoat® showed good retention in the AC during phacoemulsification and was present until the end of the procedure. The removal times of both viskoelastics were:: PMMA IOL MZ60BD: 25,0±3,7sec. (Viscoat®), 15,9±6,9sec. (ProVisc®); Acrysof IOL MA60BM: 35.5±10.0sec. (Viscoat®), 25.6±4.7sec. (ProVisc®); Silikon IOL Chiron C1043: 46.5±10.5sec. (Viscoat®), 17.3±2.1sec. (ProVisc®); Silikon IOL AMO SI 30: 33.5±3.1sec. (Viscoat®), 15.3±6.3sec., (ProVisc®); Silikon IOL P&U 912: 18.3±5.8sec. (Viscoat®), 19.8±4.3sec. (ProVisc®).
Conclusion: Both viscoelastics could be removed completely from the capsular bag. The dispersive Viscoat® showed a correlation of removal time to IOL material and design resulting in prolonged aspiration with acrylic IOLs and silicone plate lenses.
1 Department of Ophthalmology, University of Heidelberg, Germany
2 Center for Research on Ocular Therapeutics and Biodevices,
Storm Eye Institute, Medical University of South Carolina,