Evaluation of response variables in computer simulated virtual reality cataract surgery
2006 (English)In: Proceedings of SPIE, the International Society for Optical Engineering, ISSN 0277-786X, Vol. 6138, 131-139 p.Article in journal (Refereed) Published
We have developed a virtual reality (VR) simulator for phacoemulsification (phaco) surgery. The current work aimed atevaluating the precision in the estimation of response variables identified for measurement of the performance of VRphaco surgery. We identified 31 response variables measuring; the overall procedure, the foot pedal technique, thephacoemulsification technique, erroneous manipulation, and damage to ocular structures. Totally, 8 medical oroptometry students with a good knowledge of ocular anatomy and physiology but naive to cataract surgery performedthree sessions each of VR Phaco surgery. For measurement, the surgical procedure was divided into a sculpting phaseand an evacuation phase. The 31 response variables were measured for each phase in all three sessions. The variancecomponents for individuals and iterations of sessions within individuals were estimated with an analysis of varianceassuming a hierarchal model. The consequences of estimated variabilities for sample size requirements weredetermined. It was found that generally there was more variability for iterated sessions within individuals formeasurements of the sculpting phase than for measurements of the evacuation phase. This resulted in larger requiredsample sizes for detection of difference between independent groups or change within group, for the sculpting phase ascompared to for the evacuation phase. It is concluded that several of the identified response variables can be measuredwith sufficient precision for evaluation of VR phaco surgery.
Place, publisher, year, edition, pages
San José, CA: SPIE , 2006. Vol. 6138, 131-139 p.
phacoemulsification, cataract surgery, simulation
Research subject Ophtalmology
IdentifiersURN: urn:nbn:se:uu:diva-124999DOI: 10.1117/12.663541OAI: oai:DiVA.org:uu-124999DiVA: diva2:318233