This study was designed to determine whether different factors could influence the formation of posterior capsular opacities. The study group comprised 271 patients who had undergone an extracapsular cataract extraction with implantation of a posterior chamber lens either with or without laser ridge. Between 12 and 25 months after surgery, a statistically significant difference was found with a lower rate of secondary cataract in the laser ridge group, but with respect to advanced secondary cataract, i.e. eyes which needed YAG capsulotomy, no statistically significant difference was found (Fvalue 0.99). No association was found between age or sex of patients, different surgeons or complications during or after surgery and the risk of getting a secondary cataract.
In a study at the Flinders Medical Centre, South Australia, 24 glaucomatous eyes with known field defects were tested by three examiners of different backgrounds using oculo-kinetic perimetry, a screening test for glaucoma. The interrater agreement was excellent; only in one case did results differ. Seventeen eyes had a defective result, but in six cases the test was normal. Both patients and untrained staff find this test easy to do, but the apparent high false-negative rate is cause for concern and needs further evaluation. Oculokinetic perimetry may well be better used as a complementary test by those opticians doing tonometry and by general practitioners who currently rarely screen for glaucoma.
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