COMPUTERIZED VIDEOKERATOSCOPIC ANALYSIS A ND PHACOEMULSIFICATION - PREDICTION OF IOL POWER

Purpose The authors present the results of a prospective study of 125 consecutive cases of phacoemulsification, performed by a single surgeo n, to assess the benefit of computerised videokeratoscopy for the impr ovement of the predictive calculation of the power of intraocular lens es (IOL). Methods Preoperative keratometry was determined by means of 3 concurrent techniques, including automated kerato-refractometry (AKR 2000, Nidek) and videokeratoscopy by TSM-1 (Tomey) and GAS-I (EyeSys) . The results of the TOL calculation by these 3 methods was compared p ostoperatively to the power of the actual IOL yielding emmetropia as c alculated by the optical method based on the postop. refraction at the various time-points. Results Simulated values obtained with videokera toscopy significantly reduced the refractive error at I postop. week ( p = 0.001), one month (p = 0.002) and 3 months (p = 0.002) for the CAS I and at 3 hs months (p = 0.002) for the TMS1, as compared to values o btained with conventionnal automated keratometry. The refractive error was significantly reduced with the CASI at one month (p = 0.001) and 3 months (p = 0.019) as compared to TMS1. Conclusion The determination of the anterior curvature of the entrance pupil by videokeratoscopy s ignificantly improves the predictive calculation of the IOL power.