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How reproducible and stable is the reduction of intraocular pressure following extracapsular cataract extraction?



How reproducible and stable is the reduction of intraocular pressure following extracapsular cataract extraction?



Klinische Monatsblaetter fuer Augenheilkunde 207(6): 348-352



Background: Extracapsular cataract extraction with implantation of a posterior chamber lens (ECCE+PCL) lowers intraocular pressure (IOP) in most eyes. However it is believed that this effect vanishes with time. Patients and Methods: We measured IOP by Goldmann applanation tonometry in both eves of 100 consecutive patients who were either bilaterally phakic, unilaterally pseudophakic or bilaterally pseudophakic. The posterior capsule was intact in all pseudophakic eyes and none of the eyes suffered from glaucoma. Results: Median IOP was 12 mmHg for pseudophakic and 14 mmHg for phacic eyes (p lt 0.0001). The median ratio of IOP-pseudophakic/IOP-phasic (0.82) in unilaterally pseudophakics was significantly lower than the median ratio of IOP-1.pseudophakic eye/IOP-2.pseudophakic eye (1.02) in bilaterally pseudophakics (p lt 0.0001). The ratio in bilaterally pseudophakic subjects was independent of the time passed since ECCE+PCL. The distribution of the ratio of IOPs was similar for the group of bilaterally pseudophakics and bilaterally phakics. Conclusion: We conclude that the amount of lowering or IOP induced by ECCE+PCL is characteristic for each patient. It is well re producible, when the second eye is operated. The lowering of IOP does not fade with time but is stable. Possibly ECCE + PCL lowers the risk to develop glaucomatous optic nerve damage permanently.

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