title: Visual acuity prediction before neodymium-YAG laser posterior capsulotomy.
abstract: A laser interferometer (Retinometer) and the Potential Acuity Meter (PAM) was used to assess macular function before neodymium-YAG laser posterior capsulotomy in 40 patients. Although specificity was excellent with the PAM (91%) and Retinometer (93%), sensitivity was limited to 42% and 33%, respectively. Diffuse posterior capsular opacification which precluded the delivery of light through a clear portion of the capsule was the most likely cause of the high false negative rate. A positive result on either test has good predictive value, reducing the changes of the capsulotomy being a failure by fourfold.
mesh_terms: D005069:Evaluation Studies as Topic; D005544:Forecasting; D006801:Humans; D007368:Interferometry / Q000295:instrumentation; D053685:Laser Therapy; D007834:Lasers; D007903:Lens Capsule, Crystalline / Q000601:surgery*; D007908:Lens, Crystalline / Q000601:surgery*; D014787:Vision Tests / Q000295:instrumentation; D014792:Visual Acuity