[Scanning electron microscopy findings in explanted posterior chamber lenses].

Five explanted posterior chamber lenses were examined under the scanning electron microscope to determine the changes. The intraocular time of the lenses was 1 week to 3 years. The polypropylene loops showed superficial cracks in all cases, but only in the curve and the insertion areas. The findings therefore indicated that the morphological changes are more likely caused by mechanical stress than by biological degradation alone.