OBJECTIVE: To determine the extent and magnitude of unexpected @entity2516 following @entity231 surgery with intraocular lens (IOL) implantation and to determine what characteristics were associated with the errors. DESIGN: In this nonconcurrent prospective study, preoperative, intraoperative and postoperative information was collected from the charts of the 523 consecutive @entity1 who underwent @entity231 extraction and polymethylmethacrylate IOL implantation performed by one of nine participating surgeons between Jan. 1 and @entity1488 . 30, 1995, or the same dates in 1996. SETTING: University-affiliated eye care centre in Vancouver. OUTCOME MEASURE: Postoperative excess correction, calculated for each @entity1 by subtracting the actual postoperative spherical equivalent from the expected spherical equivalent. Eyes with an excess correction of more than 1.00 dioptre were considered "overcorrected." RESULTS: Univariate analysis showed that the formula used to calculate the lens power, axial length, year of surgery, A-constant/surgeon factor used and lens manufacturer were associated with overcorrection. In a logistic regression model, lens manufacturer was the only variable independently associated with overcorrection. CONCLUSIONS: Routine reporting and follow-up is necessary to identify this kind of "outbreak" and the associated factors. The current guidelines of the Health Protection Branch, Health Canada, for evaluation of IOLs that have changed manufacturers are not adequate to identify the kind of error that we detected.

An epidemiologic investigation of unexpected @entity2516 following XXXX surgery.

@entity1 :: ('9606', 'Species') :: ['patients', 'patient'] @entity231 :: ('MESH:D002386', 'Disease') :: ['cataract'] @entity2516 :: ('MESH:D012030', 'Disease') :: ['refractive errors'] @entity1488 :: ('5366', 'Gene') :: ['Apr']
@entity231 :: (MESH:D002386,Disease) :: ['cataract']
